style: show voice error message

src/locales/en-US/playground.ts

@@ -112,5 +112,9 @@ export default {
   'playground.audio.button.play': 'Play',
   'playground.audio.button.download': 'Download',
   'playground.audio.button.stop': 'Stop',
-  'playground.image.prompt.random': 'Random Prompt'
+  'playground.image.prompt.random': 'Random Prompt',
+  'playground.audio.button.fast': 'Speed Up',
+  'playground.audio.button.slow': 'Slow Down',
+  'playgorund.audio.voice.error':
+    'Voices are unavailable. The model may still be initializing. Please refresh after a brief wait.'
 };

src/locales/zh-CN/playground.ts

@@ -109,5 +109,9 @@ export default {
   'playground.audio.button.play': '播放',
   'playground.audio.button.download': '下载',
   'playground.audio.button.stop': '停止',
-  'playground.image.prompt.random': '随机提示词'
+  'playground.image.prompt.random': '随机提示词',
+  'playground.audio.button.fast': '快进',
+  'playground.audio.button.slow': '慢放',
+  'playgorund.audio.voice.error':
+    '声音无法使用。该模型可能仍在初始化。请稍候后刷新。'
 };