Add Vietnamese support to XTTS configurations and tokenizer

TTS/tts/configs/xtts_config.py

@@ -89,6 +89,7 @@ class XttsConfig(BaseTTSConfig):
             "ko",
             "ja",
             "hi",
+            "vi",
         ]
     )
 

TTS/tts/layers/xtts/tokenizer.py

@@ -639,6 +639,8 @@ class VoiceBpeTokenizer:
         elif lang == "hi":
             # @manmay will implement this
             txt = basic_cleaners(txt)
+        elif lang == "vi":
+            txt = basic_cleaners(txt)
         else:
             raise NotImplementedError(f"Language '{lang}' is not supported.")
         return txt