i18n: add mechanism for blocking new terms

.pre-commit-config.yaml

@@ -28,6 +28,14 @@ repos:
         language: system
         files: ^quickshell/(Modules/Settings/.*\.qml|Modals/Settings/SettingsSidebar\.qml|translations/extract_settings_index\.py)$
         pass_filenames: false
+  - repo: local
+    hooks:
+      - id: i18n-term-freeze
+        name: i18n term freeze (no new I18n.tr/qsTr terms)
+        entry: python3 quickshell/translations/check_term_freeze.py
+        language: system
+        files: ^quickshell/(.*\.qml|translations/(term_freeze\.json|check_term_freeze\.py|extract_translations\.py))$
+        pass_filenames: false
   - repo: local
     hooks:
       - id: no-console-in-qml