Enable injectable fall back language if there is no available translation for the device language

[timbl-ont]

Description of feature / user story

The current logic is to default to english (fall back language) if the device language does not match one of the configured languages in the app.

Instead the fallback language should be injectable from the themed wallet to be one of the configured languages.

Note: It looks like there may be some refactoring in the localization code to make language support fully injectable - i.e there is a fixed set of languages to choose from - English, French and Portuguese.

Acceptance Criteria

Initial condition: Mobile device is configured to a language not supported by Bifold and the wallet is configured to fall back to one of the supported languages (not english for testing)

On fresh install of the wallet the language displayed must be the fall back language