feat: Support i18n

qwen3-tts-frontend/src/locales/en-US/voice.json

@@ -0,0 +1,59 @@
+{
+  "voiceDesign": "Voice Design",
+  "voiceClone": "Voice Clone",
+  "designName": "Voice Name",
+  "designNamePlaceholder": "Enter voice name",
+  "designDescription": "Voice Description",
+  "designDescriptionPlaceholder": "Describe voice characteristics...",
+  "referenceAudio": "Reference Audio",
+  "uploadReference": "Upload Reference Audio",
+  "referenceText": "Reference Text",
+  "referenceTextPlaceholder": "Enter text content of reference audio...",
+  "cloneName": "Clone Name",
+  "cloneNamePlaceholder": "Enter clone voice name",
+  "cloneDescription": "Clone Description",
+  "cloneDescriptionPlaceholder": "Describe clone voice...",
+  "uploadAudio": "Upload Audio",
+  "audioFile": "Audio File",
+  "audioText": "Audio Text",
+  "audioTextPlaceholder": "Enter text corresponding to audio...",
+  "saveVoice": "Save Voice",
+  "savingVoice": "Saving...",
+  "voiceSaved": "Voice saved",
+  "voiceSaveFailed": "Voice save failed",
+  "deleteVoice": "Delete Voice",
+  "deleteVoiceConfirm": "Are you sure you want to delete this voice?",
+  "voiceDeleted": "Voice deleted",
+  "voiceList": "Voice List",
+  "noVoices": "No voices",
+  "selectVoice": "Select Voice",
+  "voiceDetails": "Voice Details",
+  "createdAt": "Created At",
+  "updatedAt": "Updated At",
+  "step1Title": "Audio Material",
+  "step2Title": "Synthesis Settings",
+  "uploadTab": "Upload Audio",
+  "recordTab": "Record Online",
+  "refAudioLabel": "Reference Audio File",
+  "refTextLabel": "Reference transcript (optional, improves accuracy)",
+  "refTextPlaceholder": "Text content corresponding to reference audio...",
+  "nextStep": "Next",
+  "prevStep": "Previous",
+  "readPrompt": "Please read one of the following paragraphs:",
+  "currentRefText": "Current reference text",
+  "currentRefTextPlaceholder": "Selected text will appear here...",
+  "languageOptional": "Language (optional)",
+  "fastMode": "Fast mode",
+  "useCache": "Use cache",
+  "uploadAudioFile": "Upload Audio",
+  "recordOnline": "Record Online",
+  "validationFailed": "File validation failed",
+  "validating": "Validating...",
+  "selectAudioFile": "Select audio file",
+  "seconds": "seconds",
+  "recordingValidationFailed": "Recording validation failed",
+  "browserNotSupported": "Your browser does not support recording",
+  "recordingComplete": "Recording complete",
+  "releaseToFinish": "Release to finish",
+  "holdToRecord": "Hold to record"
+}