Blind users with screenreader read everything in German

[andrii-i]

• Copy of Blind users with screenreader read everything in German jupyter/notebook#6924

Language

• Expectation: Language tags are specified on element based on the language the content is being displayed as. If content is in English, needs to be , etc. (WCAG Criteria 3.1.1 (A) and 3.1.2 (AA))
• Observed:
  • On all pages with my language set to English, lang="default" which reads my content in GERMAN (probably looking at the first 2 letters "de"). Need to have JS that powers this instead change to the proper lang codes.
  • If importing over the Settings Editor to Notebookv7 ever, recommend adding dropdown menu for languages so user only selects from list of languages that are currently supported/installed so bilingual blind users can easily toggle without fear of messing up.

Lang is getting set to default here:

jupyterlab/packages/translation-extension/src/index.ts

Lines 87 to 102 in 8fe49b1

	/**
	* Load the settings for this extension
	*
	* @param setting Extension settings
	*/
	function loadSetting(setting: ISettingRegistry.ISettings): void {
	// Read the settings and convert to the correct type
	currentLocale = setting.get('locale').composite as string;
	}
	settings
	.load(PLUGIN_ID)
	.then(setting => {
	// Read the settings
	loadSetting(setting);
	document.documentElement.lang = (currentLocale ?? '').replace('_', '-');