Allow country & language selection from the settings

[teolemon]

What

• Allow country selection from the settings
  feat: #849 - added country selector to preferences page #861
• Allow language selection from the settings

Why

• Users who travel
• Debugging
• Taking localized screenshots
• Making localized demos

Part of

• ⚙️ Settings (tracker) #960

V1 screenshot

[monsieurtanuki]

@teolemon Some remarks:

• "Allow country selection from the settings": that may make sense for muggles that travel, fair enough
• "Allow language selection from the settings": so far we take the default locale of the device (Localizations.localeOf(context).languageCode), and I don't see the obvious use case for muggles - especially because it would mean reloading the whole product database. Shouldn't we better keep that one for wizards only, I mean in dev mode?

[M123-dev]

Yes, I am also in favour of keeping the language private

[jasmeet0817]

AFAICR, default language is the device language, in which case I also agree, we shouldn't make it configurable.

…

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-- Cheers, Jasmeet Singh

[monsieurtanuki]

The public country part was done in #861.

[monsieurtanuki]

For the record you can already change the app language: just change the smartphone language.
Doing so you'll be as clean as possible (e.g. no default labels in another language).

[Roto15]

In my opinion it will be good to have the possibility to choose the language of the app from the settings because they are not so many languages that are fully translated.If someone want to add or edit a product its better that the information is correctly entered.

[UgoKo-Rubeast]

I'm now working on this issue to confirm whether the app language is able to be changed, but I failed and this is my implementation.
#1729
Is there any way to change the language? I found this following post about how to change the language manually. Should we do like that and add shared_preferences dependence?
https://medium.com/flutter-community/flutter-internationalization-the-easy-way-using-provider-and-json-c47caa4212b2

[M123-dev]

Heyy @UgoKo-Rubeast, we are already using shared_preferences, when I remember right it is not in the dependencies since it's build-in into flutter or something like that,

I've just had a look at your #1729, and you are right, what you are doing there is updating the product preferences and not the main app. The article you send looks promising but as the language selection should probably be hidden for most users I don't think we need a provider for that, manually restarting the app should be more then enouph.

What I would recommend:

• Add a ListTile to the dev-settings which is set to "Automatically" initially.
• If someone changes it store it in the preferences.
• And in the MaterialApp, check if something is stored in the preferences, if not use the standard language.