feat(mobile): exclude locales from overpass font

[johnstef99]

Fixes #10436

As mentioned here this PR adds a list of languages that should be excluded from using Overpass as a font. These languages will use the default Flutter font based on the platform.

As of right now the only known to me language having a problem is Greek, feel free to exclude more if needed.

[alextran1502]

What is the purpose of this overrides property?

[johnstef99]

It sets the localeProvider value for the rest subtree of widgets every time that context.locale gets updated. Do you have an alternative way of settings the initial value of localeProvider and then updating it?

[VelocityRa]

As of right now the only known to me language having a problem is Greek, feel free to exclude more if needed.

Serbian Cyrillic has the issue too: #11216, could be added now.
Might also want to tweak the filtering to take the country code into account too - Serbian Cyrillic is specifically Locale('sr', 'Cyrl'), there's Serbian Latin too which presumably renders fine (I asked on the issue to make sure).

[johnstef99]

As of right now the only known to me language having a problem is Greek, feel free to exclude more if needed.

Serbian Cyrillic has the issue too: #11216, could be added now. Might also want to tweak the filtering to take the country code into account too - Serbian Cyrillic is specifically Locale('sr', 'Cyrl'), there's Serbian Latin too which presumably renders fine (I asked on the issue to make sure).

Ok I will update it to filter with region/country subtag and exclude Locale('sr', 'Cyrl')

[alextran1502]

The localProvider isn't used correctly here, as the value never updates. The theme is already initialized when the locale changes, so you don't need the provider.

You can achieve the same effect by removing the localProvider across the app then changing the getThemeData method signature to the following

[johnstef99]

Have you tested that the localeProvider's value never changes? Because I can't reproduce it. When the EasyLocalization parent widget rebuilds the localeProvider's value gets updated.

Let me explain why I added this provider:

1. In the MapThemeOveride widget we also need the locale to get the theme data. If conext.locale was used here, it would be difficult for the widget to be tested (and there are already written tests for this widget). The already written test will have to be refactored to have as parent widget the EasyLocalization.
2. I have opened an other MR that also needs the localeProvider for the reason that some UI elements are cached by providers. That results on not refreshing the UI after the user changing language.