Add preset locations

[ozankaraali]

So far I am opening this issue because we want to preset locations for new-coming users.

Basically, we need to design a welcoming modal. That asks the user for language and location. I have " country flags" on my mind, but I am not sure yet, it might be a filterable list also. I don't know which user interface would be more efficient.

Anyway, after asking for language/location, it should change strings by the language provided. For the location, the user can set global/worldwide to download the current preset playlist. Otherwise, it should return to the country playlist (see: https://github.com/iptv-org/iptv#grouped-by-country).

I am opening this issue if someone wants to try before me since it's somehow one of the easy tasks, if not I will do it eventually.
I am not expecting this task to be a ten-minute task and also I do not intend to make anyone work for me for free. As I said before if you want to do it before me, you're welcome to try; otherwise, I will do it eventually.