services(tts): initialize language to the proper language code

src/pipecat/services/aws.py

@@ -99,7 +99,7 @@ class AWSTTSService(TTSService):
             "engine": params.engine,
             "language": self.language_to_service_language(params.language)
             if params.language
-            else Language.EN,
+            else "en-US",
             "pitch": params.pitch,
             "rate": params.rate,
             "volume": params.volume,

src/pipecat/services/azure.py

@@ -178,7 +178,7 @@ class AzureBaseTTSService(TTSService):
             "emphasis": params.emphasis,
             "language": self.language_to_service_language(params.language)
             if params.language
-            else Language.EN_US,
+            else "en-US",
             "pitch": params.pitch,
             "rate": params.rate,
             "role": params.role,

src/pipecat/services/cartesia.py

@@ -112,7 +112,7 @@ class CartesiaTTSService(WordTTSService):
             },
             "language": self.language_to_service_language(params.language)
             if params.language
-            else Language.EN,
+            else "en",
             "speed": params.speed,
             "emotion": params.emotion,
         }
@@ -326,7 +326,7 @@ class CartesiaHttpTTSService(TTSService):
             },
             "language": self.language_to_service_language(params.language)
             if params.language
-            else Language.EN,
+            else "en",
             "speed": params.speed,
             "emotion": params.emotion,
         }

src/pipecat/services/elevenlabs.py

@@ -177,7 +177,7 @@ class ElevenLabsTTSService(WordTTSService):
             "sample_rate": sample_rate_from_output_format(output_format),
             "language": self.language_to_service_language(params.language)
             if params.language
-            else Language.EN,
+            else "en",
             "output_format": output_format,
             "optimize_streaming_latency": params.optimize_streaming_latency,
             "stability": params.stability,

src/pipecat/services/google.py

@@ -546,7 +546,7 @@ class GoogleTTSService(TTSService):
             "emphasis": params.emphasis,
             "language": self.language_to_service_language(params.language)
             if params.language
-            else Language.EN,
+            else "en-US",
             "gender": params.gender,
             "google_style": params.google_style,
         }