i18n: Enforce dennis lint warnings in CI (#4105)

.github/workflows/test-only.yml

@@ -35,18 +35,38 @@ jobs:
         run: |
           pip install "$(grep -E '^dennis ?>=' requirements.txt)"
           dennis-cmd lint --errorsonly changedetectionio/translations/
-      - name: Lint .pot template with dennis (warnings, informational)
+      - name: Lint .pot template with dennis (baseline-limited warnings)
+        # BASELINE: dennis warnings present when this check was introduced. Ratchet down only.
+        # Each time a warning is fixed, lower BASELINE_LIMIT to lock in the improvement.
+        # Once it reaches 0, replace this step with a strict (`warnings > 0` fails) check,
+        # matching the `.po` step.
+        env:
+          BASELINE_LIMIT: 12
         run: |
-          dennis-cmd lint changedetectionio/translations/messages.pot
-      - name: Lint .po files with dennis (warnings, informational)
+          output=$(dennis-cmd lint changedetectionio/translations/messages.pot)
+          echo "$output"
+          warnings=$(echo "$output" | awk '/Warnings:/ {print $NF; exit}')
+          if (( ${warnings:-0} > BASELINE_LIMIT )); then
+            echo "ERROR: ${warnings} dennis warning(s) exceed baseline of ${BASELINE_LIMIT} in messages.pot"
+            echo "Fix the new warning(s). BASELINE_LIMIT may only ratchet downward."
+            exit 1
+          fi
+      - name: Lint .po files with dennis (warnings)
         # W302 (unchanged) and W303 (html mismatch) are excluded due to
         # high false-positive rate in this codebase:
         # many msgstrs intentionally match msgid (units like "Mb", proper nouns),
         # and many msgids contain literal "<title>"/"<description>" text that isn't actual HTML.
         run: |
-          dennis-cmd lint \
+          output=$(dennis-cmd lint \
             --excluderules=W302,W303 \
-            changedetectionio/translations/*/LC_MESSAGES/messages.po
+            changedetectionio/translations/*/LC_MESSAGES/messages.po)
+          echo "$output"
+          warnings=$(echo "$output" | awk '/Total number of warnings:/ {print $NF; exit}')
+          if (( ${warnings:-0} > 0 )); then
+            echo "ERROR: ${warnings} dennis warning(s) detected in .po files"
+            echo "Fix the warning(s)."
+            exit 1
+          fi
       - name: Check translation catalog is up-to-date
         run: |
           pip install "$(grep -E '^babel==' requirements.txt)"