记忆播放器设置菜单（含自动翻译菜单）选择的字幕语言和播放速度。默认中文（简体）字幕/默认字幕（双语）；找不到匹配的语言时，匹配前缀，例如中文（简体）->中文
These are all versions of this script. Show only the versions where the code changed.
fix: should not show control if there isn't subtitles
fix bug of transcript over 1 hour
fix downloaded transcript timestamp bug
change subtitle format to vtt and fix download bug
fix bug for openTranscript failure
remove alert message
