feat(dev_tools): add translation editor for browsing and editing UI translations

New admin page to browse, search, compare, and inline-edit translation
keys across all modules and languages from the browser.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/dev_tools/locales/de.json

@@ -14,7 +14,24 @@
         "components": "Komponenten",
         "icons": "Icons",
         "sql_query": "SQL Abfrage",
-        "platform_debug": "Plattform Debug"
+        "platform_debug": "Plattform Debug",
+        "translation_editor": "Übersetzungseditor"
+    },
+    "translation_editor": {
+        "title": "Übersetzungseditor",
+        "all_modules": "Alle Module",
+        "search_placeholder": "Schlüssel und Werte suchen...",
+        "filter_all": "Alle",
+        "filter_missing": "Fehlende",
+        "filter_variables": "Variablen",
+        "module": "Modul",
+        "key_path": "Schlüsselpfad",
+        "missing": "fehlend",
+        "saving": "Speichern...",
+        "no_results": "Keine Übersetzungsschlüssel entsprechen Ihren Filtern.",
+        "loading": "Übersetzungen werden geladen...",
+        "previous": "Zurück",
+        "next": "Weiter"
     },
     "sql_query": {
         "title": "SQL Abfrage-Werkzeug",