fix(mobile): fixes on language change

[johnstef99]

This pull request fixes several problems around the flow of changing language:

1. When you change language some widgets in the pages [SettingsSubPage, SettingsPage, LibraryPage] stay in the old language.
2. Because across the app, you don't pass the context.locale to DateFormat, by default Intl uses the system's locale. This means that even after selecting a language in the immich settings, the dates will stay in the system's language.
3. I created a new provider localeProvider that can be used inside other providers to invalidate them whenever the locale is changed. This is needed because immich has providers that cache UI elements. I added the localeProvider only to the asset providers of the photos page but I am sure someone with more knowledge of the codebase can find other instances where it's needed.

Before fix:

not_fixed.mp4

After fix:
As you can see when changing language both settings and photo grid get updated.

fixed.mp4

[NicholasFlamy]

@johnstef99 Is PR #14035 related to one of the issues you're fixing?

[johnstef99]

Is kind of related, because the user describes this:

Changing my phone to English does resolve the issue.

That means that DateFormat does not use the context.locale and instead uses the phone's locale. That problem is going to get fixed by this change here

[NicholasFlamy]

Is kind of related, because the user describes this:

Changing my phone to English does resolve the issue.

That means that DateFormat does not use the context.locale and instead uses the phone's locale. That problem is going to get fixed by this change here

Okay, just wanna be sure your changes and that PR don't conflict.

[johnstef99]

No conflicts for sure. The #14035 initialises the date formatter, but this PR make the date formatter use the selected locale from immich settings.