diff --git a/frontend/resources/vue/App.vue b/frontend/resources/vue/App.vue
index f170735..01a2b6d 100644
--- a/frontend/resources/vue/App.vue
+++ b/frontend/resources/vue/App.vue
@@ -55,19 +55,19 @@
 
     <dialog ref="languageDialog" class="language-dialog" @click="handleDialogClick">
         <div class="dialog-content" @click.stop>
-            <h2>Select Language</h2>
+            <h2>{{ t('language-dialog.title') }}</h2>
             <select v-model="selectedLanguage" @change="changeLanguage" class="language-select">
                 <option v-for="(name, code) in availableLanguages" :key="code" :value="code">
                     {{ name }}
                 </option>
             </select>
             <p class="browser-languages">
-                Browser languages: 
+                {{ t('language-dialog.browser-languages') }}: 
                 <span v-if="browserLanguages.length > 0">{{ browserLanguages.join(', ') }}</span>
-                <span v-else>Not available</span>
+                <span v-else>{{ t('language-dialog.not-available') }}</span>
             </p>
             <div class="dialog-buttons">
-                <button @click="closeLanguageDialog">Close</button>
+                <button @click="closeLanguageDialog">{{ t('language-dialog.close') }}</button>
             </div>
         </div>
     </dialog>
diff --git a/lang/combined_output.json b/lang/combined_output.json
index e7cd1df..cc90e3b 100644
--- a/lang/combined_output.json
+++ b/lang/combined_output.json
@@ -1 +1 @@
-{"messages":{"de-DE":{"connected":"Verbunden","docs":"Dokumentation","login-button":"Login","logs.action":"Aktion","logs.metadata":"Metadaten","logs.no-logs-to-display":"Es gibt keine Protokolle zu anzeigen.","logs.page-description":"Dies ist eine Liste von Protokollen von Aktionen, die ausgeführt wurden. Sie können die Liste nach Aktionstitel filtern.","logs.status":"Status","logs.timestamp":"Zeitstempel","logs.title":"Protokolle","nav.actions":"Aktionen","nav.diagnostics":"Diagnostik","nav.entities":"Entitäten","nav.logs":"Protokolle","raise-issue":"Ein Problem melden auf GitHub","return-to-index":"Zurück zur Startseite","search-filter":"Filter aktuelle Seite","welcome":"Willkommen bei OliveTin"},"en":{"connected":"Connected","docs":"Documentation","login-button":"Login","logs.action":"Action","logs.metadata":"Metadata","logs.no-logs-to-display":"There are no logs to display.","logs.page-description":"This is a list of logs from actions that have been executed. You can filter the list by action title.","logs.status":"Status","logs.timestamp":"Timestamp","logs.title":"Logs","nav.actions":"Actions","nav.diagnostics":"Diagnostics","nav.entities":"Entities","nav.logs":"Logs","raise-issue":"Raise an issue on GitHub","return-to-index":"Return to index","search-filter":"Filter current page","welcome":"Welcome to OliveTin"},"es-ES":{"connected":"Conectado","docs":"Documentación","login-button":"Iniciar sesión","logs.action":"Acción","logs.metadata":"Metadatos","logs.no-logs-to-display":"No hay registros para mostrar.","logs.page-description":"Esta es una lista de registros de acciones que han sido ejecutadas. Puede filtrar la lista por título de acción.","logs.status":"Status","logs.timestamp":"Timestamp","logs.title":"Registros","nav.actions":"Acciones","nav.diagnostics":"Diagnósticos","nav.entities":"Entidades","nav.logs":"Registros","raise-issue":"Reportar un problema en GitHub","return-to-index":"Volver a la página principal","search-filter":"Filtrar página actual","welcome":"Bienvenido a OliveTin"},"it-IT":{"connected":"Connesso","docs":"Documentazione","login-button":"Login","logs.action":"Azione","logs.metadata":"Metadati","logs.no-logs-to-display":"Non ci sono registri da mostrare.","logs.page-description":"Questa è una lista di registri delle azioni che sono state eseguite. Puoi filtrare la lista per titolo dell'azione.","logs.status":"Status","logs.timestamp":"Timestamp","logs.title":"Registri","logs.user":"Utente","nav.actions":"Azioni","nav.diagnostics":"Diagnostica","nav.entities":"Entità","nav.logs":"Registri","raise-issue":"Segnala un problema su GitHub","return-to-index":"Torna alla pagina principale","search-filter":"Filtra la pagina corrente","welcome":"Benvenuto in OliveTin"},"zh-Hans-CN":{"connected":"已连接","docs":"文档","login-button":"登录","logs.action":"动作","logs.metadata":"元数据","logs.no-logs-to-display":"没有日志可显示。","logs.page-description":"这是一个动作执行日志列表。您可以按动作标题过滤列表。","logs.status":"状态","logs.timestamp":"时间戳","logs.title":"日志","nav.actions":"动作","nav.diagnostics":"诊断","nav.entities":"实体","nav.logs":"日志","raise-issue":"报告问题 on GitHub","return-to-index":"返回首页","search-filter":"过滤当前页面","welcome":"欢迎使用 OliveTin"}}}
\ No newline at end of file
+{"messages":{"de-DE":{"connected":"Verbunden","docs":"Dokumentation","language-dialog.browser-languages":"Browser-Sprachen","language-dialog.close":"Schließen","language-dialog.not-available":"Nicht verfügbar","language-dialog.title":"Sprache auswählen","login-button":"Login","logs.action":"Aktion","logs.metadata":"Metadaten","logs.no-logs-to-display":"Es gibt keine Protokolle zu anzeigen.","logs.page-description":"Dies ist eine Liste von Protokollen von Aktionen, die ausgeführt wurden. Sie können die Liste nach Aktionstitel filtern.","logs.status":"Status","logs.timestamp":"Zeitstempel","logs.title":"Protokolle","nav.actions":"Aktionen","nav.diagnostics":"Diagnostik","nav.entities":"Entitäten","nav.logs":"Protokolle","raise-issue":"Ein Problem melden auf GitHub","return-to-index":"Zurück zur Startseite","search-filter":"Filter aktuelle Seite","welcome":"Willkommen bei OliveTin"},"en":{"connected":"Connected","docs":"Documentation","language-dialog.browser-languages":"Browser languages","language-dialog.close":"Close","language-dialog.not-available":"Not available","language-dialog.title":"Select Language","login-button":"Login","logs.action":"Action","logs.metadata":"Metadata","logs.no-logs-to-display":"There are no logs to display.","logs.page-description":"This is a list of logs from actions that have been executed. You can filter the list by action title.","logs.status":"Status","logs.timestamp":"Timestamp","logs.title":"Logs","nav.actions":"Actions","nav.diagnostics":"Diagnostics","nav.entities":"Entities","nav.logs":"Logs","raise-issue":"Raise an issue on GitHub","return-to-index":"Return to index","search-filter":"Filter current page","welcome":"Welcome to OliveTin"},"es-ES":{"connected":"Conectado","docs":"Documentación","language-dialog.browser-languages":"Idiomas del navegador","language-dialog.close":"Cerrar","language-dialog.not-available":"No disponible","language-dialog.title":"Seleccionar idioma","login-button":"Iniciar sesión","logs.action":"Acción","logs.metadata":"Metadatos","logs.no-logs-to-display":"No hay registros para mostrar.","logs.page-description":"Esta es una lista de registros de acciones que han sido ejecutadas. Puede filtrar la lista por título de acción.","logs.status":"Status","logs.timestamp":"Timestamp","logs.title":"Registros","nav.actions":"Acciones","nav.diagnostics":"Diagnósticos","nav.entities":"Entidades","nav.logs":"Registros","raise-issue":"Reportar un problema en GitHub","return-to-index":"Volver a la página principal","search-filter":"Filtrar página actual","welcome":"Bienvenido a OliveTin"},"it-IT":{"connected":"Connesso","docs":"Documentazione","language-dialog.browser-languages":"Lingue del browser","language-dialog.close":"Chiudi","language-dialog.not-available":"Non disponibile","language-dialog.title":"Seleziona lingua","login-button":"Login","logs.action":"Azione","logs.metadata":"Metadati","logs.no-logs-to-display":"Non ci sono registri da mostrare.","logs.page-description":"Questa è una lista di registri delle azioni che sono state eseguite. Puoi filtrare la lista per titolo dell'azione.","logs.status":"Status","logs.timestamp":"Timestamp","logs.title":"Registri","nav.actions":"Azioni","nav.diagnostics":"Diagnostica","nav.entities":"Entità","nav.logs":"Registri","raise-issue":"Segnala un problema su GitHub","return-to-index":"Torna alla pagina principale","search-filter":"Filtra la pagina corrente","welcome":"Benvenuto in OliveTin"},"zh-Hans-CN":{"connected":"已连接","docs":"文档","language-dialog.browser-languages":"浏览器语言","language-dialog.close":"关闭","language-dialog.not-available":"不可用","language-dialog.title":"选择语言","login-button":"登录","logs.action":"动作","logs.metadata":"元数据","logs.no-logs-to-display":"没有日志可显示。","logs.page-description":"这是一个动作执行日志列表。您可以按动作标题过滤列表。","logs.status":"状态","logs.timestamp":"时间戳","logs.title":"日志","nav.actions":"动作","nav.diagnostics":"诊断","nav.entities":"实体","nav.logs":"日志","raise-issue":"在 GitHub 上报告问题","return-to-index":"返回首页","search-filter":"过滤当前页面","welcome":"欢迎使用 OliveTin"}}}
\ No newline at end of file
diff --git a/lang/de-DE.yaml b/lang/de-DE.yaml
index ad7ec6e..52962dc 100644
--- a/lang/de-DE.yaml
+++ b/lang/de-DE.yaml
@@ -17,4 +17,8 @@ translations:
   logs.status: Status
   logs.no-logs-to-display: Es gibt keine Protokolle zu anzeigen.
   return-to-index: Zurück zur Startseite
-  search-filter: Filter aktuelle Seite
\ No newline at end of file
+  search-filter: Filter aktuelle Seite
+  language-dialog.title: Sprache auswählen
+  language-dialog.browser-languages: Browser-Sprachen
+  language-dialog.not-available: Nicht verfügbar
+  language-dialog.close: Schließen
\ No newline at end of file
diff --git a/lang/en.yaml b/lang/en.yaml
index 2e80a56..7020935 100644
--- a/lang/en.yaml
+++ b/lang/en.yaml
@@ -17,4 +17,8 @@ translations:
   logs.status: Status
   logs.no-logs-to-display: There are no logs to display.
   return-to-index: Return to index
-  search-filter: Filter current page
\ No newline at end of file
+  search-filter: Filter current page
+  language-dialog.title: Select Language
+  language-dialog.browser-languages: Browser languages
+  language-dialog.not-available: Not available
+  language-dialog.close: Close
\ No newline at end of file
diff --git a/lang/es-ES.yaml b/lang/es-ES.yaml
index 72b28a4..19e7f15 100644
--- a/lang/es-ES.yaml
+++ b/lang/es-ES.yaml
@@ -17,4 +17,8 @@ translations:
   logs.status: Status
   logs.no-logs-to-display: No hay registros para mostrar.
   return-to-index: Volver a la página principal
-  search-filter: Filtrar página actual
\ No newline at end of file
+  search-filter: Filtrar página actual
+  language-dialog.title: Seleccionar idioma
+  language-dialog.browser-languages: Idiomas del navegador
+  language-dialog.not-available: No disponible
+  language-dialog.close: Cerrar
\ No newline at end of file
diff --git a/lang/it-IT.yaml b/lang/it-IT.yaml
index a9e057e..2ac7512 100644
--- a/lang/it-IT.yaml
+++ b/lang/it-IT.yaml
@@ -17,4 +17,8 @@ translations:
   logs.status: Status
   logs.no-logs-to-display: Non ci sono registri da mostrare.
   return-to-index: Torna alla pagina principale
-  search-filter: Filtra la pagina corrente
\ No newline at end of file
+  search-filter: Filtra la pagina corrente
+  language-dialog.title: Seleziona lingua
+  language-dialog.browser-languages: Lingue del browser
+  language-dialog.not-available: Non disponibile
+  language-dialog.close: Chiudi
\ No newline at end of file
diff --git a/lang/main.go b/lang/main.go
index c22745a..d8bd039 100644
--- a/lang/main.go
+++ b/lang/main.go
@@ -90,9 +90,72 @@ func getCombinedLanguageContent() *CombinedTranslationsOutput {
 		output.Messages[languageName] = yamlData.Translations
 	}
 
+	validateTranslations(output)
+
 	return output
 }
 
+// getReferenceKeys returns the keys from the "en" translation as the reference set.
+func getReferenceKeys(messages map[string]map[string]string) map[string]bool {
+	enTranslations, exists := messages["en"]
+	if !exists {
+		return nil
+	}
+
+	referenceKeys := make(map[string]bool, len(enTranslations))
+	for key := range enTranslations {
+		referenceKeys[key] = true
+	}
+	return referenceKeys
+}
+
+// findMissingKeys returns the keys that are in referenceKeys but not in translations.
+func findMissingKeys(referenceKeys map[string]bool, translations map[string]string) []string {
+	missing := make([]string, 0)
+	for key := range referenceKeys {
+		if _, exists := translations[key]; !exists {
+			missing = append(missing, key)
+		}
+	}
+	return missing
+}
+
+// findExtraKeys returns the keys that are in translations but not in referenceKeys.
+func findExtraKeys(referenceKeys map[string]bool, translations map[string]string) []string {
+	extra := make([]string, 0)
+	for key := range translations {
+		if !referenceKeys[key] {
+			extra = append(extra, key)
+		}
+	}
+	return extra
+}
+
+// validateTranslations checks all translations against the "en" reference and prints warnings for missing and extra keys.
+func validateTranslations(output *CombinedTranslationsOutput) {
+	referenceKeys := getReferenceKeys(output.Messages)
+	if referenceKeys == nil {
+		log.Warnf("No 'en' translation found, skipping validation")
+		return
+	}
+
+	for langName, translations := range output.Messages {
+		if langName == "en" {
+			continue
+		}
+
+		missing := findMissingKeys(referenceKeys, translations)
+		if len(missing) > 0 {
+			log.Warnf("Translation '%s' is missing %d key(s): %v", langName, len(missing), missing)
+		}
+
+		extra := findExtraKeys(referenceKeys, translations)
+		if len(extra) > 0 {
+			log.Warnf("Translation '%s' has %d extra key(s) not in 'en': %v", langName, len(extra), extra)
+		}
+	}
+}
+
 func filterLanguageFiles(files []os.DirEntry) []os.DirEntry {
 	ret := make([]os.DirEntry, 0)
 
diff --git a/lang/zh-Hans-CN.yaml b/lang/zh-Hans-CN.yaml
index b3b9fac..c97377e 100644
--- a/lang/zh-Hans-CN.yaml
+++ b/lang/zh-Hans-CN.yaml
@@ -17,4 +17,8 @@ translations:
   logs.status: 状态
   logs.no-logs-to-display: 没有日志可显示。
   return-to-index: 返回首页
-  search-filter: 过滤当前页面
\ No newline at end of file
+  search-filter: 过滤当前页面
+  language-dialog.title: 选择语言
+  language-dialog.browser-languages: 浏览器语言
+  language-dialog.not-available: 不可用
+  language-dialog.close: 关闭
\ No newline at end of file