Render questionnaire in different language using language extension

[fredhersch]

Is your feature request related to a problem? Please describe.
Support for language extensions within a FHIR questionnaire

Describe the solution you'd like

• When given a Questionnaire with different language extensions, be able to render in the appropriate language based on the Android language settings
• If no language extension is available for the local language, show the default language (usually English) for the item
• Show related controls using the local language (from strings.xml) e.g. list selection options, back/forward (for multi-step questionnaire)

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Issue #161 has link to the updated Questionnaire with Vietnamese translations

Would you like to work on the issue?
Happy to support

[fredhersch]

See this issue #166 for discussion about implementing language support

[fredhersch]

@jingtang10 can we update this questionnaire in the SDC Gallery app and see this working?

[aditya-07]

@fredhersch I have already added the questionnaire in the SDC Gallery app and its available for everyone to checkout.

[jingtang10]

This isn't done yet as per @fredhersch's requirements:

• Show related controls using the local language (from strings.xml) e.g. list selection options, back/forward (for multi-step questionnaire)

Might create a new issue for that instead.

@pld raised a question about custom locale rather than using android system locale. After testing I realized you can set it by using Locale.setLocale API in your activity/fragment. So I think this is entirely doable by implementers with the current library following @aditya-07 's change.

[fredhersch]

@jingtang10 @aditya-07 I opened a new issue here - #503
Let's confirm if the Locale.setLocale API change will enable this. Thanks