feat: Provide a way to find out language variant of current locale

[marcelklehr]

Feature Request

Description

Device.getLanguageCode() only returns a two letter code, which is not enough in the case of chinese for example.

Platform(s)

• Android
• iOS

Preferred Solution

Maybe a Device.getLanguageVariant() or Device.getFullLanguageCode() method. I'm not too particular about this.

[jcesarmobile]

as workaround you can use navigator.language, it returns the whole code, or also navigator.languages, this one returns an array of all the languages added to the device, in case the first one is not supported you can fallback to the following

[jcesarmobile]

4.0.0 beta 0 has a new getLanguageTag function available

[ionitron-bot]

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