multi-lang and multi-region support

[chlxt]

Is your feature request related to a problem? Please describe.

Currently skytube only support choose one content country and one preferred region in settings, I think multiple language/region for selection is much better.

Describe the solution you'd like

1. Skytube team may change radio button to checkbox for users to select multiple languages and regions simultaneously.
2. contents from different langs/regions can be aggregated into one TRENDING tab or different TRENDING tabs.

thanks.

[gzsombor]

Apart from aggregating different regions into one, intermixed tab, it doesn't seems too difficult to implement.