Cant set Youtube language back to default

[raszpl]

youtube/js&css/web-accessible/www.youtube.com/settings.js

Lines 180 to 196 in 967ccbb

	ImprovedTube.youtubeLanguage = function () {
	var value = this.storage.youtube_language;
	if (this.isset(value)) {
	var pref = this.getCookieValueByName('PREF');
	if (value !== 'default') {
	var hl = this.getParam(pref, 'hl');
	if (hl) {
	this.setCookie('PREF', pref.replace('hl=' + hl, 'hl=' + value));
	} else {
	this.setCookie('PREF', pref + '&hl=' + value);
	}
	}
	}
	};

This is only able to overwrite Cookie to any value but "default", as a result when user switches this setting back to Default nothing changes. Needs a way to extract default browser language and write that to the cookie.

To reproduce

• go to improvetube settings
• set YT language to Korean
• realize you dont know Korean and cant navigate YT at all :D
• go back to improvetube settings and change back to Default

Nothing happens, you are stuck with Korean, not every user will realize you can fix language in YT menu, especially if they set weird language and cant read menu now Oh its worse. Even switching language in Youtube wont help because ImproveTube calls ImprovedTube.youtubeLanguage() on init and overrides it every single time :D

[raszpl]

Fixed version is not entirely right. Now setting Default deletes PREF cookie language &hl= every single time. This needs additional toggle.

[raszpl]

The best would be one more option on the language list at the top called "disabled" triggering:
satus.storage.remove('youtube_language')
something like [{value: null, text: "Disabled"}]