snapshot of https://github.com/zulip/zulip.git @ 48c69911c7dd4e03b20552eb3bd77ad8151c1357 (2026-09-15)

tools/check-frontend-i18n

@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+import argparse
+import json
+import os
+import subprocess
+import sys
+
+sys.path.append(os.path.join(os.path.dirname(__file__), ".."))
+
+# check for the venv
+from tools.lib import sanity_check
+
+sanity_check.check_venv(__file__)
+
+from scripts.lib.zulip_tools import ENDC, FAIL, WARNING
+
+
+def find_handlebars(translatable_strings: list[str]) -> list[str]:
+    return [string for string in translatable_strings if "{{" in string]
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--no-generate", action="store_true", help="Don't run makemessages command."
+    )
+    args = parser.parse_args()
+
+    if not args.no_generate:
+        subprocess.check_call(
+            ["./manage.py", "makemessages", "--locale", "en"], stderr=subprocess.STDOUT
+        )
+
+    with open("locale/en/translations.json") as f:
+        data = json.load(f)
+
+    found = find_handlebars(list(data.keys()))
+    if not found:
+        sys.exit(0)
+
+    print(WARNING + "Translation strings contain Handlebars:" + ENDC)
+    print("\n".join(found))
+
+    print(
+        WARNING
+        + "See https://zulip.readthedocs.io/en/latest/translating/internationalization.html#web-application-translations "
+        "on how you can insert variables in the frontend translatable "
+        "strings." + ENDC
+    )
+    print(FAIL + "Failed!" + ENDC)
+    sys.exit(1)