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/definition.py

@@ -36,6 +36,7 @@ dev_tools_module = ModuleDefinition(
         "test_runner",  # Test execution
         "violation_management",  # Violation tracking and assignment
         "sql_query",  # Ad-hoc SQL query tool
+        "translation_editor",  # UI translation editor
     ],
     menu_items={
         FrontendType.ADMIN: [
@@ -44,6 +45,7 @@ dev_tools_module = ModuleDefinition(
             "code-quality",  # Code quality dashboard
             "tests",  # Test runner dashboard
             "sql-query",  # SQL query tool
+            "translation-editor",  # Translation editor
         ],
         FrontendType.STORE: [],  # No store menu items - internal module
     },
@@ -85,6 +87,13 @@ dev_tools_module = ModuleDefinition(
                         route="/admin/platform-debug",
                         order=40,
                     ),
+                    MenuItemDefinition(
+                        id="translation-editor",
+                        label_key="dev_tools.menu.translation_editor",
+                        icon="globe",
+                        route="/admin/translation-editor",
+                        order=50,
+                    ),
                 ],
             ),
         ],