Language support

[marc4gov]

Is your feature request related to a problem? Please describe.
I would like to introduce uPort in the Netherlands for clients not able or reluctant to read English

Describe the solution you'd like
Some sort of JSON settings file I can edit in order to change the default titles and messages to a preferred language

Describe alternatives you've considered
I cloned and edited this repo and managed to change some bits and pieces hard coded in the App tsx files, but I missed some and it's hard to keep consistent

Additional context
I did manage to see my changes in the ios simulator, building it with Xcode is a terrible experience however, so I'm not following this path anymore