pre-commit: Run scripts/find_localised_strings.py

This will report on any missing LANG comments at commit time. NB: set to
run on all files in case of L10n/en.template changes.

.pre-commit-config.yaml

@@ -66,6 +66,15 @@ repos:
         args: [check, --bare, -r]
         language: system
 
+# Check translation comments are up to date
+- repo: local
+  hooks:
+    - id: LANG_comments
+      name: 'LANG comments'
+      language: system
+      entry: python scripts/find_localised_strings.py --compare-lang L10n/en.template --directory . --ignore coriolis-data --ignore dist.win32
+      pass_filenames: false
+
 default_language_version:
     python: python3.9