Feature Request: Localization for trending iv-org#331

[DmitrySandalov]

Closes #331

1. If a region is set in the URL region=JP (like this), it will be used first
2. Alternatively if a region is set in preferences UI, it will be used next
3. If not set in URL and preferences, then the config.yml will be used
4. If not set in 1-3, then the default value is assigned region=US

The preferences UI has a dropdown now with the list of available content regions. (I've used REGIONS first, but most of them gave 500 internal error. So, I've tested it with a script and set TRENDING_REGIONS which do not give 500 error.)

[SamantazFox]

I'm deploying this on https://test.invidious.io

[DmitrySandalov]

I've tested the feature on https://test.invidious.io. Working as expected for me. (Was obviously not able to check default_user_preferences).

[SamantazFox]

Was obviously not able to check default_user_preferences.

I've set the region in the config to DE. I confirm that it works!

[SamantazFox]

Could you please rebase your changes? Sorry for the inconvenience, I had to merge large PRs :)

Nevermind, I could do it, so I did!

[SamantazFox]

thanks for your contribution to invidious @DmitrySandalov :)