[Feature Request] Support for installing language packs by link

[EricKotato]

Is your feature request related to a problem? Please describe. Even though WebK is supported on Telegram's Translation Platform, it has no support for tg://setlanguage?lang=<lang_code> and https://t.me/setlanguage/<lang_code> links. These links allow to install a language from Translation Platform if corresponding pack is available.

Describe the solution you'd like Support for custom languages and installation of them through tg://setlanguage?lang=<lang_code> and https://t.me/setlanguage/<lang_code> links.