Implement active task management for downloads and generations, enhancing user experience with toast notifications for ongoing tasks. Refactor language handling in forms to support multiple languages. Update audio player to manage restart functionality and improve sidebar icon representation. Adjust progress tracking for model downloads in the backend.

backend/utils/validation.py

@@ -29,17 +29,20 @@ def validate_text(text: str, max_length: int = 5000) -> Tuple[bool, Optional[str
 def validate_language(language: str) -> Tuple[bool, Optional[str]]:
     """
     Validate language code.
-    
+
+    Supported languages for Qwen3-TTS:
+    Chinese, English, Japanese, Korean, German, French, Russian, Portuguese, Spanish, Italian
+
     Args:
         language: Language code
-        
+
     Returns:
         Tuple of (is_valid, error_message)
     """
-    valid_languages = ["en", "zh"]
+    valid_languages = ["zh", "en", "ja", "ko", "de", "fr", "ru", "pt", "es", "it"]
     if language not in valid_languages:
         return False, f"Invalid language (must be one of: {', '.join(valid_languages)})"
-    
+
     return True, None