[Feature request] change subtitles colors

[Yumega]

add feature to change subtitles colors for all playing videos

[unixfox]

Related: videojs/video.js#8297

[SamantazFox]

This is possible by going into this menu:

However, the settings are reset between each videos, and the following CSS prevents the background from being changed (why was it even added in the first place? to look more like YT?):

invidious/assets/css/player.css

Lines 84 to 88 in eda7444

	.video-js .vjs-text-track-display > div > div > div {
	background-color: rgba(0, 0, 0, 0.75) !important;
	border-radius: 9px !important;
	padding: 5px !important;
	}