fix: tts model tip (#2221)

web/i18n/lang/common.en.ts

@@ -249,8 +249,8 @@ const translation = {
       tip: 'Set the default model for speech-to-text input in conversation.',
     },
     ttsModel: {
-      key: 'Speech-to-Text Model',
-      tip: 'Set the default model for speech-to-text input in conversation.',
+      key: 'Text-to-Speech Model',
+      tip: 'Set the default model for text-to-speech input in conversation.',
     },
     rerankModel: {
       key: 'Rerank Model',