Small fix for 3.14 setup

.github/workflows/test-only.yml

@@ -52,4 +52,13 @@ jobs:
     uses: ./.github/workflows/test-stack-reusable-workflow.yml
     with:
       python-version: '3.13'
-      skip-pypuppeteer: true
+      skip-pypuppeteer: true
+
+
+  test-application-3-14:
+    #if: github.event_name == 'push' && github.ref == 'refs/heads/master'
+    needs: lint-code
+    uses: ./.github/workflows/test-stack-reusable-workflow.yml
+    with:
+      python-version: '3.14'
+      skip-pypuppeteer: false

MANIFEST.in

@@ -11,6 +11,7 @@ recursive-include changedetectionio/realtime *
 recursive-include changedetectionio/static *
 recursive-include changedetectionio/templates *
 recursive-include changedetectionio/tests *
+recursive-include changedetectionio/translations *
 recursive-include changedetectionio/widgets *
 prune changedetectionio/static/package-lock.json
 prune changedetectionio/static/styles/node_modules

changedetectionio/__init__.py

@@ -2,7 +2,7 @@
 
 # Read more https://github.com/dgtlmoon/changedetection.io/wiki
 # Semver means never use .01, or 00. Should be .1.
-__version__ = '0.52.3'
+__version__ = '0.52.6'
 
 from changedetectionio.strtobool import strtobool
 from json.decoder import JSONDecodeError
@@ -41,9 +41,10 @@ from loguru import logger
 #
 # IMPLEMENTATION:
 #   1. Explicit contexts everywhere (primary protection):
-#      - Watch.py: ctx = multiprocessing.get_context('spawn')
 #      - playwright.py: ctx = multiprocessing.get_context('spawn')
 #      - puppeteer.py: ctx = multiprocessing.get_context('spawn')
+#      - isolated_opencv.py: ctx = multiprocessing.get_context('spawn')
+#      - isolated_libvips.py: ctx = multiprocessing.get_context('spawn')
 #
 #   2. Global default (defense-in-depth, below):
 #      - Safety net if future code forgets explicit context

changedetectionio/async_update_worker.py

@@ -1,5 +1,4 @@
 from blinker import signal
-
 from .processors.exceptions import ProcessorException
 import changedetectionio.content_fetchers.exceptions as content_fetchers_exceptions
 from changedetectionio.processors.text_json_diff.processor import FilterNotFoundInResponse
@@ -9,7 +8,6 @@ from changedetectionio.flask_app import watch_check_update
 import asyncio
 import importlib
 import os
-import queue
 import time
 
 from loguru import logger

changedetectionio/blueprint/watchlist/__init__.py

@@ -2,7 +2,6 @@ import os
 import time
 
 from flask import Blueprint, request, make_response, render_template, redirect, url_for, flash, session
-from flask_login import current_user
 from flask_paginate import Pagination, get_page_parameter
 
 from changedetectionio import forms
@@ -85,6 +84,7 @@ def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMe
             app_rss_token=datastore.data['settings']['application'].get('rss_access_token'),
             datastore=datastore,
             errored_count=errored_count,
+            extra_classes='has-queue' if len(update_q.queue) else '',
             form=form,
             generate_tag_colors=processors.generate_processor_badge_colors,
             guid=datastore.data['app_guid'],
@@ -92,9 +92,10 @@ def construct_blueprint(datastore: ChangeDetectionStore, update_q, queuedWatchMe
             hosted_sticky=os.getenv("SALTED_PASS", False) == False,
             now_time_server=round(time.time()),
             pagination=pagination,
+            processor_badge_css=processors.get_processor_badge_css(),
             processor_badge_texts=processors.get_processor_badge_texts(),
             processor_descriptions=processors.get_processor_descriptions(),
-            processor_badge_css=processors.get_processor_badge_css(),
+            queue_size=len(update_q.queue),
             queued_uuids=[q_uuid.item['uuid'] for q_uuid in update_q.queue],
             search_q=request.args.get('q', '').strip(),
             sort_attribute=request.args.get('sort') if request.args.get('sort') else request.cookies.get('sort'),

changedetectionio/blueprint/watchlist/templates/watch-overview.html

@@ -99,9 +99,14 @@ html[data-darkmode="true"] .watch-tag-list.tag-{{ class_name }} {
                        data-confirm-message="{{ _('<p>Are you sure you want to delete the selected watches?</strong></p><p>This action cannot be undone.</p>') }}"
                        data-confirm-button="{{ _('Delete') }}"><i data-feather="trash" style="width: 14px; height: 14px; stroke: white; margin-right: 4px;"></i>{{ _('Delete') }}</button>
     </div>
-    {%- if watches|length >= pagination.per_page -%}
-        {{ pagination.info }}
-    {%- endif -%}
+
+    <div id="stats_row">
+        <div class="left">{%- if watches|length >= pagination.per_page -%}{{ pagination.info }}{%- endif -%}</div>
+        <div class="right" >{{ _('Queued size') }}: <span id="queue-size-int">{{ queue_size }}</span></div>
+    </div>
+
+
+
     {%- if search_q -%}<div id="search-result-info">{{ _('Searching') }} "<strong><i>{{search_q}}</i></strong>"</div>{%- endif -%}
     <div>
         <a href="{{url_for('watchlist.index')}}" class="pure-button button-tag {{'active' if not active_tag_uuid }}">{{ _('All') }}</a>

changedetectionio/content_fetchers/webdriver_selenium.py

@@ -156,6 +156,9 @@ class fetcher(Fetcher):
                     from PIL import Image
                     import io
                     img = Image.open(io.BytesIO(screenshot_png))
+                    # Convert to RGB if needed (JPEG doesn't support transparency)
+                    if img.mode != 'RGB':
+                        img = img.convert('RGB')
                     jpeg_buffer = io.BytesIO()
                     img.save(jpeg_buffer, format='JPEG', quality=int(os.getenv("SCREENSHOT_QUALITY", 72)))
                     self.screenshot = jpeg_buffer.getvalue()

changedetectionio/flask_app.py

@@ -9,6 +9,7 @@ import threading
 import time
 import timeago
 from blinker import signal
+from pathlib import Path
 
 from changedetectionio.strtobool import strtobool
 from threading import Event
@@ -84,6 +85,10 @@ app.config['NEW_VERSION_AVAILABLE'] = False
 if os.getenv('FLASK_SERVER_NAME'):
     app.config['SERVER_NAME'] = os.getenv('FLASK_SERVER_NAME')
 
+# Babel/i18n configuration
+app.config['BABEL_TRANSLATION_DIRECTORIES'] = str(Path(__file__).parent / 'translations')
+app.config['BABEL_DEFAULT_LOCALE'] = 'en_GB'
+
 #app.config["EXPLAIN_TEMPLATE_LOADING"] = True
 
 
@@ -395,13 +400,9 @@ def changedetection_app(config=None, datastore_o=None):
     def get_locale():
         # 1. Try to get locale from session (user explicitly selected)
         if 'locale' in session:
-            locale = session['locale']
-            logger.trace(f"DEBUG: get_locale() returning from session: {locale}")
-            return locale
+            return session['locale']
         # 2. Fall back to Accept-Language header
-        locale = request.accept_languages.best_match(language_codes)
-        logger.trace(f"DEBUG: get_locale() returning from Accept-Language: {locale}")
-        return locale
+        return request.accept_languages.best_match(language_codes)
 
     # Initialize Babel with locale selector
     babel = Babel(app, locale_selector=get_locale)
@@ -518,9 +519,20 @@ def changedetection_app(config=None, datastore_o=None):
     @app.route('/set-language/<locale>')
     def set_language(locale):
         """Set the user's preferred language in the session"""
+        if not request.cookies:
+            logger.error("Cannot set language without session cookie")
+            flash("Cannot set language without session cookie", 'error')
+            return redirect(url_for('watchlist.index'))
+
         # Validate the locale against available languages
         if locale in language_codes:
             session['locale'] = locale
+
+            # CRITICAL: Flask-Babel caches the locale in the request context (ctx.babel_locale)
+            # We must refresh to clear this cache so the new locale takes effect immediately
+            # This is especially important for tests where multiple requests happen rapidly
+            from flask_babel import refresh
+            refresh()
         else:
             logger.error(f"Invalid locale {locale}, available: {language_codes}")
 

changedetectionio/languages.py

@@ -29,6 +29,9 @@ def get_timeago_locale(flask_locale):
     """
     locale_map = {
         'zh': 'zh_CN',      # Chinese Simplified
+        # timeago library just hasn't been updated to use the more modern locale naming convention, before BCP 47 / RFC 5646.
+        'zh_TW': 'zh_TW',   # Chinese Traditional (timeago uses zh_TW)
+        'zh_Hant_TW': 'zh_TW',  # Flask-Babel normalizes zh_TW to zh_Hant_TW, map back to timeago's zh_TW
         'pt': 'pt_PT',      # Portuguese (Portugal)
         'sv': 'sv_SE',      # Swedish
         'no': 'nb_NO',      # Norwegian Bokmål
@@ -53,7 +56,7 @@ LANGUAGE_DATA = {
     'it': {'flag': 'fi fi-it fis', 'name': 'Italiano'},
     'ja': {'flag': 'fi fi-jp fis', 'name': '日本語'},
     'zh': {'flag': 'fi fi-cn fis', 'name': '中文 (简体)'},
-    'zh_TW': {'flag': 'fi fi-tw fis', 'name': '繁體中文'},
+    'zh_Hant_TW': {'flag': 'fi fi-tw fis', 'name': '繁體中文'},
     'ru': {'flag': 'fi fi-ru fis', 'name': 'Русский'},
     'pl': {'flag': 'fi fi-pl fis', 'name': 'Polski'},
     'nl': {'flag': 'fi fi-nl fis', 'name': 'Nederlands'},

changedetectionio/model/Watch.py

@@ -18,21 +18,31 @@ BROTLI_COMPRESS_SIZE_THRESHOLD = int(os.getenv('SNAPSHOT_BROTLI_COMPRESSION_THRE
 minimum_seconds_recheck_time = int(os.getenv('MINIMUM_SECONDS_RECHECK_TIME', 3))
 mtable = {'seconds': 1, 'minutes': 60, 'hours': 3600, 'days': 86400, 'weeks': 86400 * 7}
 
-def _brotli_compress_worker(conn, filepath, mode=None):
+def _brotli_save(contents, filepath, mode=None, fallback_uncompressed=False):
     """
-    Worker function to compress data with brotli in a separate process.
-    This isolates memory - when process exits, OS reclaims all memory.
+    Save compressed data using native brotli.
+    Testing shows no memory leak when using gc.collect() after compression.
 
     Args:
-        conn: multiprocessing.Pipe connection to receive data
+        contents: data to compress (str or bytes)
         filepath: destination file path
         mode: brotli compression mode (e.g., brotli.MODE_TEXT)
+        fallback_uncompressed: if True, save uncompressed on failure; if False, raise exception
+
+    Returns:
+        str: actual filepath saved (may differ from input if fallback used)
+
+    Raises:
+        Exception: if compression fails and fallback_uncompressed is False
     """
     import brotli
+    import gc
+
+    # Ensure contents are bytes
+    if isinstance(contents, str):
+        contents = contents.encode('utf-8')
 
     try:
-        # Receive data from parent process via pipe (avoids pickle overhead)
-        contents = conn.recv()
         logger.debug(f"Starting brotli compression of {len(contents)} bytes.")
 
         if mode is not None:
@@ -43,111 +53,25 @@ def _brotli_compress_worker(conn, filepath, mode=None):
         with open(filepath, 'wb') as f:
             f.write(compressed_data)
 
-        # Send success status back
-        conn.send(True)
         logger.debug(f"Finished brotli compression - From {len(contents)} to {len(compressed_data)} bytes.")
-        # No need for explicit cleanup - process exit frees all memory
-    except Exception as e:
-        logger.critical(f"Brotli compression worker failed: {e}")
-        conn.send(False)
-    finally:
-        conn.close()
 
+        # Force garbage collection to prevent memory buildup
+        gc.collect()
 
-def _brotli_subprocess_save(contents, filepath, mode=None, timeout=30, fallback_uncompressed=False):
-    """
-    Save compressed data using subprocess to isolate memory.
-    Uses Pipe to avoid pickle overhead for large data.
-
-    Args:
-        contents: data to compress (str or bytes)
-        filepath: destination file path
-        mode: brotli compression mode (e.g., brotli.MODE_TEXT)
-        timeout: subprocess timeout in seconds
-        fallback_uncompressed: if True, save uncompressed on failure; if False, raise exception
-
-    Returns:
-        str: actual filepath saved (may differ from input if fallback used)
-
-    Raises:
-        Exception: if compression fails and fallback_uncompressed is False
-    """
-    import multiprocessing
-    import sys
-
-    # Ensure contents are bytes
-    if isinstance(contents, str):
-        contents = contents.encode('utf-8')
-
-    # Use explicit spawn context for thread safety (avoids fork() with multi-threaded parent)
-    # Always use spawn - consistent behavior in tests and production
-    ctx = multiprocessing.get_context('spawn')
-    parent_conn, child_conn = ctx.Pipe()
-
-    # Run compression in subprocess using spawn (not fork)
-    proc = ctx.Process(target=_brotli_compress_worker, args=(child_conn, filepath, mode))
-
-    # Windows-safe: Set daemon=False explicitly to avoid issues with process cleanup
-    proc.daemon = False
-    proc.start()
-
-    try:
-        # Send data to subprocess via pipe (avoids pickle)
-        parent_conn.send(contents)
-
-        # Wait for result with timeout
-        if parent_conn.poll(timeout):
-            success = parent_conn.recv()
-        else:
-            success = False
-            logger.warning(f"Brotli compression subprocess timed out after {timeout}s")
-            # Graceful termination with platform-aware cleanup
-            try:
-                proc.terminate()
-            except Exception as term_error:
-                logger.debug(f"Process termination issue (may be normal on Windows): {term_error}")
-
-        parent_conn.close()
-        proc.join(timeout=5)
-
-        # Force kill if still alive after graceful termination
-        if proc.is_alive():
-            try:
-                if sys.platform == 'win32':
-                    # Windows: use kill() which is more forceful
-                    proc.kill()
-                else:
-                    # Unix: terminate() already sent SIGTERM, now try SIGKILL
-                    proc.kill()
-                proc.join(timeout=2)
-            except Exception as kill_error:
-                logger.warning(f"Failed to kill brotli compression process: {kill_error}")
-
-        # Check if file was created successfully
-        if success and os.path.exists(filepath):
-            return filepath
+        return filepath
 
     except Exception as e:
         logger.error(f"Brotli compression error: {e}")
-        try:
-            parent_conn.close()
-        except:
-            pass
-        try:
-            proc.terminate()
-            proc.join(timeout=2)
-        except:
-            pass
 
-    # Compression failed
-    if fallback_uncompressed:
-        logger.warning(f"Brotli compression failed for {filepath}, saving uncompressed")
-        fallback_path = filepath.replace('.br', '')
-        with open(fallback_path, 'wb') as f:
-            f.write(contents)
-        return fallback_path
-    else:
-        raise Exception(f"Brotli compression subprocess failed for {filepath}")
+        # Compression failed
+        if fallback_uncompressed:
+            logger.warning(f"Brotli compression failed for {filepath}, saving uncompressed")
+            fallback_path = filepath.replace('.br', '')
+            with open(fallback_path, 'wb') as f:
+                f.write(contents)
+            return fallback_path
+        else:
+            raise Exception(f"Brotli compression failed for {filepath}: {e}")
 
 
 class model(watch_base):
@@ -523,7 +447,7 @@ class model(watch_base):
 
                 if not os.path.exists(dest):
                     try:
-                        actual_dest = _brotli_subprocess_save(contents, dest, mode=brotli.MODE_TEXT, fallback_uncompressed=True)
+                        actual_dest = _brotli_save(contents, dest, mode=brotli.MODE_TEXT, fallback_uncompressed=True)
                         if actual_dest != dest:
                             snapshot_fname = os.path.basename(actual_dest)
                     except Exception as e:
@@ -949,13 +873,13 @@ class model(watch_base):
     def save_last_text_fetched_before_filters(self, contents):
         import brotli
         filepath = os.path.join(self.watch_data_dir, 'last-fetched.br')
-        _brotli_subprocess_save(contents, filepath, mode=brotli.MODE_TEXT, fallback_uncompressed=False)
+        _brotli_save(contents, filepath, mode=brotli.MODE_TEXT, fallback_uncompressed=False)
 
     def save_last_fetched_html(self, timestamp, contents):
         self.ensure_data_dir_exists()
         snapshot_fname = f"{timestamp}.html.br"
         filepath = os.path.join(self.watch_data_dir, snapshot_fname)
-        _brotli_subprocess_save(contents, filepath, mode=None, fallback_uncompressed=True)
+        _brotli_save(contents, filepath, mode=None, fallback_uncompressed=True)
         self._prune_last_fetched_html_snapshots()
 
     def get_fetched_html(self, timestamp):

changedetectionio/processors/image_ssim_diff/image_handler/isolated_libvips.py

@@ -13,14 +13,9 @@ Research: https://github.com/libvips/pyvips/issues/234
 
 import multiprocessing
 
-# CRITICAL: Use 'spawn' instead of 'fork' to avoid inheriting parent's
+# CRITICAL: Use 'spawn' context instead of 'fork' to avoid inheriting parent's
 # LibVIPS threading state which can cause hangs in gaussblur operations
 # https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods
-try:
-    multiprocessing.set_start_method('spawn', force=False)
-except RuntimeError:
-    # Already set, ignore
-    pass
 
 
 def _worker_generate_diff(conn, img_bytes_from, img_bytes_to, threshold, blur_sigma, max_width, max_height):
@@ -95,9 +90,10 @@ def generate_diff_isolated(img_bytes_from, img_bytes_to, threshold, blur_sigma,
     Returns:
         bytes: JPEG diff image or None on failure
     """
-    parent_conn, child_conn = multiprocessing.Pipe()
+    ctx = multiprocessing.get_context('spawn')
+    parent_conn, child_conn = ctx.Pipe()
 
-    p = multiprocessing.Process(
+    p = ctx.Process(
         target=_worker_generate_diff,
         args=(child_conn, img_bytes_from, img_bytes_to, threshold, blur_sigma, max_width, max_height)
     )
@@ -140,7 +136,8 @@ def calculate_change_percentage_isolated(img_bytes_from, img_bytes_to, threshold
     Returns:
         float: Change percentage
     """
-    parent_conn, child_conn = multiprocessing.Pipe()
+    ctx = multiprocessing.get_context('spawn')
+    parent_conn, child_conn = ctx.Pipe()
 
     def _worker_calculate(conn):
         try:
@@ -185,7 +182,7 @@ def calculate_change_percentage_isolated(img_bytes_from, img_bytes_to, threshold
         finally:
             conn.close()
 
-    p = multiprocessing.Process(target=_worker_calculate, args=(child_conn,))
+    p = ctx.Process(target=_worker_calculate, args=(child_conn,))
     p.start()
 
     result = 0.0
@@ -233,7 +230,8 @@ def compare_images_isolated(img_bytes_from, img_bytes_to, threshold, blur_sigma,
         tuple: (changed_detected, change_percentage)
     """
     print(f"[Parent] Starting compare_images_isolated subprocess", flush=True)
-    parent_conn, child_conn = multiprocessing.Pipe()
+    ctx = multiprocessing.get_context('spawn')
+    parent_conn, child_conn = ctx.Pipe()
 
     def _worker_compare(conn):
         try:
@@ -301,7 +299,7 @@ def compare_images_isolated(img_bytes_from, img_bytes_to, threshold, blur_sigma,
         finally:
             conn.close()
 
-    p = multiprocessing.Process(target=_worker_compare, args=(child_conn,))
+    p = ctx.Process(target=_worker_compare, args=(child_conn,))
     print(f"[Parent] Starting subprocess (pid will be assigned)", flush=True)
     p.start()
     print(f"[Parent] Subprocess started (pid={p.pid}), waiting for result (30s timeout)", flush=True)

changedetectionio/static/js/realtime.js

@@ -76,7 +76,7 @@ $(document).ready(function () {
 
     // Cache DOM elements for performance
     const queueBubble = document.getElementById('queue-bubble');
-
+    const queueSizePagerInfoText = document.getElementById('queue-size-int');
     // Only try to connect if authentication isn't required or user is authenticated
     // The 'is_authenticated' variable will be set in the template
     if (typeof is_authenticated !== 'undefined' ? is_authenticated : true) {
@@ -118,6 +118,10 @@ $(document).ready(function () {
 
             socket.on('queue_size', function (data) {
                 console.log(`${data.event_timestamp} - Queue size update: ${data.q_length}`);
+                if(queueSizePagerInfoText) {
+                    queueSizePagerInfoText.textContent = parseInt(data.q_length).toLocaleString() || 'None';
+                }
+                document.body.classList.toggle('has-queue', parseInt(data.q_length) > 0);
 
                 // Update queue bubble in action sidebar
                 //if (queueBubble) {

changedetectionio/static/styles/scss/parts/_pagination.scss

@@ -1,6 +1,4 @@
 .pagination-page-info {
-  color: #fff;
-  font-size: 0.85rem;
   text-transform: capitalize;
 }
 

changedetectionio/static/styles/scss/parts/_watch_table.scss

@@ -1,4 +1,32 @@
 /* table related */
+#stats_row {
+  display: flex;
+  align-items: center;
+  width: 100%;
+  color: #fff;
+  font-size: 0.85rem;
+  >* {
+    padding-bottom: 0.5rem;
+  }
+  .left {
+    text-align: left;
+  }
+
+  .right {
+    opacity: 0.5;
+    transition: opacity 0.6s ease;
+    margin-left: auto; /* pushes it to the far right */
+    text-align: right;
+  }
+}
+body.has-queue {
+  #stats_row {
+    .right {
+      opacity: 1.0;
+    }
+  }
+}
+
 .watch-table {
   width: 100%;
   font-size: 80%;

changedetectionio/templates/base.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="{{ get_locale() }}" data-darkmode="{{ get_darkmode_state() }}">
+<html lang="{{ get_locale()|replace('_', '-') }}" data-darkmode="{{ get_darkmode_state() }}">
 
   <head>
     <meta charset="utf-8" >

changedetectionio/tests/conftest.py

@@ -2,6 +2,7 @@
 import psutil
 import time
 from threading import Thread
+import multiprocessing
 
 import pytest
 import arrow
@@ -97,6 +98,34 @@ def cleanup(datastore_path):
             if os.path.isfile(f):
                 os.unlink(f)
 
+def pytest_configure(config):
+    """Configure pytest environment before tests run.
+
+    CRITICAL: Set multiprocessing start method to 'fork' for Python 3.14+ compatibility.
+
+    Python 3.14 changed the default start method from 'fork' to 'forkserver' on Linux.
+    The forkserver method requires all objects to be picklable, but pytest-flask's
+    LiveServer uses nested functions that can't be pickled.
+
+    Setting 'fork' explicitly:
+    - Maintains compatibility with Python 3.10-3.13 (where 'fork' was already default)
+    - Fixes Python 3.14 pickling errors
+    - Only affects Unix-like systems (Windows uses 'spawn' regardless)
+
+    See: https://github.com/python/cpython/issues/126831
+    See: https://docs.python.org/3/whatsnew/3.14.html
+    """
+    # Only set if not already set (respects existing configuration)
+    if multiprocessing.get_start_method(allow_none=True) is None:
+        try:
+            # 'fork' is available on Unix-like systems (Linux, macOS)
+            # On Windows, this will have no effect as 'spawn' is the only option
+            multiprocessing.set_start_method('fork', force=False)
+            logger.debug("Set multiprocessing start method to 'fork' for Python 3.14+ compatibility")
+        except (ValueError, RuntimeError):
+            # Already set, not available on this platform, or context already created
+            pass
+
 def pytest_addoption(parser):
     """Add custom command-line options for pytest.
 

changedetectionio/tests/test_i18n.py

@@ -1,7 +1,71 @@
 #!/usr/bin/env python3
 
 from flask import url_for
-from .util import live_server_setup
+from .util import live_server_setup, wait_for_all_checks
+
+
+def test_zh_TW(client, live_server, measure_memory_usage, datastore_path):
+    import time
+    test_url = url_for('test_endpoint', _external=True)
+
+    # Be sure we got a session cookie
+    res = client.get(url_for("watchlist.index"), follow_redirects=True)
+
+    res = client.get(
+        url_for("set_language", locale="zh_Hant_TW"), # Traditional
+        follow_redirects=True
+    )
+    # HTML follows BCP 47 language tag rules, not underscore-based locale formats.
+    assert b'<html lang="zh-Hant-TW"' in res.data
+    assert b'Cannot set language without session cookie' not in res.data
+    assert '選擇語言'.encode() in res.data
+
+    # Check second set works
+    res = client.get(
+        url_for("set_language", locale="en_GB"),
+        follow_redirects=True
+    )
+    assert b'Cannot set language without session cookie' not in res.data
+    res = client.get(url_for("watchlist.index"), follow_redirects=True)
+    assert b"Select Language" in res.data, "Second set of language worked"
+
+    # Check arbitration between zh_Hant_TW<->zh
+    res = client.get(
+        url_for("set_language", locale="zh"), # Simplified chinese
+        follow_redirects=True
+    )
+    res = client.get(url_for("watchlist.index"), follow_redirects=True)
+    assert "选择语言".encode() in res.data, "Simplified chinese worked and it means the flask-babel cache worked"
+
+
+# timeago library just hasn't been updated to use the more modern locale naming convention, before BCP 47 / RFC 5646.
+# The Python timeago library (https://github.com/hustcc/timeago) supports 48 locales but uses different naming conventions than Flask-Babel.
+def test_zh_Hant_TW_timeago_integration():
+    """Test that zh_Hant_TW mapping works and timeago renders Traditional Chinese correctly"""
+    import timeago
+    from datetime import datetime, timedelta
+    from changedetectionio.languages import get_timeago_locale
+
+    # 1. Test the mapping
+    mapped_locale = get_timeago_locale('zh_Hant_TW')
+    assert mapped_locale == 'zh_TW', "zh_Hant_TW should map to timeago's zh_TW"
+    assert get_timeago_locale('zh_TW') == 'zh_TW', "zh_TW should also map to zh_TW"
+
+    # 2. Test timeago library renders Traditional Chinese with the mapped locale
+    now = datetime.now()
+
+    # Test various time periods with Traditional Chinese strings
+    result_15s = timeago.format(now - timedelta(seconds=15), now, mapped_locale)
+    assert '秒前' in result_15s, f"Expected '秒前' in '{result_15s}'"
+
+    result_5m = timeago.format(now - timedelta(minutes=5), now, mapped_locale)
+    assert '分鐘前' in result_5m, f"Expected '分鐘前' in '{result_5m}'"
+
+    result_2h = timeago.format(now - timedelta(hours=2), now, mapped_locale)
+    assert '小時前' in result_2h, f"Expected '小時前' in '{result_2h}'"
+
+    result_3d = timeago.format(now - timedelta(days=3), now, mapped_locale)
+    assert '天前' in result_3d, f"Expected '天前' in '{result_3d}'"
 
 
 def test_language_switching(client, live_server, measure_memory_usage, datastore_path):
@@ -13,6 +77,9 @@ def test_language_switching(client, live_server, measure_memory_usage, datastore
     3. Switch back to English and verify English text appears
     """
 
+    # Establish session cookie
+    client.get(url_for("watchlist.index"), follow_redirects=True)
+
     # Step 1: Set the language to Italian using the /set-language endpoint
     res = client.get(
         url_for("set_language", locale="it"),
@@ -61,6 +128,9 @@ def test_invalid_locale(client, live_server, measure_memory_usage, datastore_pat
     The app should ignore invalid locales and continue working.
     """
 
+    # Establish session cookie
+    client.get(url_for("watchlist.index"), follow_redirects=True)
+
     # First set to English
     res = client.get(
         url_for("set_language", locale="en"),
@@ -93,6 +163,9 @@ def test_language_persistence_in_session(client, live_server, measure_memory_usa
     within the same session.
     """
 
+    # Establish session cookie
+    client.get(url_for("watchlist.index"), follow_redirects=True)
+
     # Set language to Italian
     res = client.get(
         url_for("set_language", locale="it"),
@@ -119,6 +192,9 @@ def test_set_language_with_redirect(client, live_server, measure_memory_usage, d
     """
     from flask import url_for
 
+    # Establish session cookie
+    client.get(url_for("watchlist.index"), follow_redirects=True)
+
     # Set language with a redirect parameter (simulating language change from /settings)
     res = client.get(
         url_for("set_language", locale="de", redirect="/settings"),

requirements.txt

@@ -42,7 +42,7 @@ orjson~=3.11
 # jq not available on Windows so must be installed manually
 
 # Notification library
-apprise==1.9.5
+apprise==1.9.6
 
 diff_match_patch
 
@@ -70,7 +70,7 @@ lxml >=4.8.0,!=5.2.0,!=5.2.1,<7
 
 # XPath 2.0-3.1 support - 4.2.0 had issues, 4.1.5 stable
 # Consider updating to latest stable version periodically
-elementpath==5.0.4
+elementpath==5.1.0
 
 # For fast image comparison in screenshot change detection
 # opencv-python-headless is OPTIONAL (excluded from requirements.txt)
@@ -91,7 +91,7 @@ jq~=1.3; python_version >= "3.8" and sys_platform == "linux"
 
 # playwright is installed at Dockerfile build time because it's not available on all platforms
 
-pyppeteer-ng==2.0.0rc10
+pyppeteer-ng==2.0.0rc11
 pyppeteerstealth>=0.0.4
 
 # Include pytest, so if theres a support issue we can ask them to run these tests on their setup
@@ -100,7 +100,7 @@ pytest-flask ~=1.3
 pytest-mock ~=3.15
 
 # Anything 4.0 and up but not 5.0
-jsonschema ~= 4.25
+jsonschema ~= 4.26
 
 # OpenAPI validation support
 openapi-core[flask] >= 0.19.0