fix: glossary selection respects target language — sort by source+target, reset on lang change, fix template import

- GlossarySelector: filteredGlossaries now sorts matching target_language
  first so FR→FA appears before FR→EN when translating to Persian
- GlossarySelector: toggle auto-select prefers glossary matching
  targetLang, falls back to first available
- useTranslationConfig: reset glossaryId when targetLang changes (was
  only resetting on sourceLang change)
- glossary_routes: set target_language from template data on import
  (was missing, defaulted to None/en)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/app/dashboard/translate/useTranslationConfig.ts

@@ -80,10 +80,10 @@ export function useTranslationConfig(hasFile: boolean): UseTranslationConfigRetu
     }
   }, [settings.defaultTargetLanguage]); // eslint-disable-line react-hooks/exhaustive-deps
 
-  // Reset glossary selection when source language changes
+  // Reset glossary selection when source or target language changes
   useEffect(() => {
     setGlossaryId(null);
-  }, [sourceLang]); // eslint-disable-line react-hooks/exhaustive-deps
+  }, [sourceLang, targetLang]); // eslint-disable-line react-hooks/exhaustive-deps
 
   // Fetch available (admin-configured) providers
   useEffect(() => {