feat: use correct lang_code

tts.py

@@ -138,7 +138,6 @@ def main():
             # Disable all warnings
             warnings.filterwarnings("ignore")
 
-        pipeline = KPipeline(lang_code='a', device=args.device, repo_id='hexgrad/Kokoro-82M')
         if args.voice in voices:
             voice=voices[args.voice]
         else:
@@ -168,6 +167,9 @@ def main():
         name = name.replace("\\", "_")
         name = name.replace("/", "_")
 
+        lang_code = voice[0]
+        pipeline = KPipeline(lang_code=lang_code, device=args.device, repo_id='hexgrad/Kokoro-82M')
+
         '''
             Split patterns:
             - only multiple consecutive new line (to handle wrapped statements)