fix(transmitters): preserve target language in get_formatted_date lookup

- Allow YearValue to return translations in any requested target language
- Only fallback to 'en' when invoking date_engine format_canonical_date

apps/hadis/models/transmitter.py

@@ -310,8 +310,6 @@ class Transmitters(LowercaseSlugMixin, models.Model):
         raw_str = str(raw_val).strip()
 
         target_lang = (lang or 'ru').split('-')[0].lower()
-        if target_lang not in ('ru', 'en', 'ar'):
-            target_lang = 'en'
 
         # Check prefetched narrator_dates first if available
         if hasattr(self, '_prefetched_objects_cache') and 'narrator_dates' in self._prefetched_objects_cache:
@@ -330,7 +328,8 @@ class Transmitters(LowercaseSlugMixin, models.Model):
                     return txt
 
         from ..utils.date_engine import format_canonical_date
-        return format_canonical_date(raw_str, category=date_type, lang=target_lang)
+        engine_lang = target_lang if target_lang in ('ru', 'en', 'ar') else 'en'
+        return format_canonical_date(raw_str, category=date_type, lang=engine_lang)
 
     def get_formatted_birth_year(self, lang: str = 'ru') -> Optional[str]:
         return self.get_formatted_date('birth', lang=lang)