feat(i18n): unify django api error resolution

lobby/i18n.py

@@ -24,6 +24,15 @@ def lobby_i18n_error_messages() -> dict:
     return shared_i18n_catalog().get("backend", {}).get("errors", {})
 
 
+def resolve_error_key(code: str) -> str:
+    resolved = lobby_i18n_errors().get(code)
+    if isinstance(resolved, str) and resolved:
+        return resolved
+
+    LOGGER.warning("i18n error code missing in shared catalog", extra={"code": code})
+    return code
+
+
 def _quality_value(language_candidate: str) -> float | None:
     for parameter in language_candidate.split(";")[1:]:
         key, separator, value = parameter.partition("=")
@@ -78,12 +87,13 @@ def resolve_error_message(*, key: str, locale: str) -> str:
     return key
 
 
-def api_error(request: HttpRequest, *, key: str, status: int) -> JsonResponse:
+def api_error(request: HttpRequest, *, code: str, status: int) -> JsonResponse:
     locale = resolve_locale(request)
+    key = resolve_error_key(code)
     return JsonResponse(
         {
             "error": resolve_error_message(key=key, locale=locale),
-            "error_code": key,
+            "error_code": code,
             "locale": locale,
         },
         status=status,