Add few more media playback symbols to the Closed Captions generator

[kamekku14]

The Closed Captions generator already has "Play", "Stop", "Rewind" and "Fast Forward" symbols, but there's no other symbols like the "Pause" and "Mute" symbols.

So, would it be possible to include the media playback symbols other than the said symbols above? Here are some of them:

• Pause ⏸
• Mute 🔇
• Previous Chapter ⏮
• Next Chapter ⏭
• Record ⏺
• Eject ⏏