doclang
If locale is not null, it sets the document locale to its value. If it's null, the localized name of the current document locale is returned.
Return
the localized name of the current document locale if locale is null
Parameters
locale
(optional) case-insensitive, either a locale tag (e.g. en, en-US, it, fr-CA) or an English name of a locale (e.g. English, English (United States), Italian, French (Canada)) to assign to the document
Throws
if the locale tag is not invalid or not found