Locale country is not used for initial language detection and not passed to CoreLibs

[sfionov]

• Language is detected incorrectly initially in Application and ApplicationService (only "lang" code based on Locale.getLanguage() (without country code) is searched but not "lang-cc", so some languages with country code may not be detected by default).
• Locale.getLanguage() (without country code) is passed to CoreLibs instead of application language.

Currently it is a problem only for Chinese and Portuguese locales.

[sfionov]

Related issue is AdguardTeam/CoreLibs#805

[lancelot-moon]

Confirmed while Android system language is Traditional Chinese (繁體中文, locale: zh-TW).
This is fixed in v3.0.344η.