Allow Spotify URL with country code (intl-xx)

[etn406]

Spotify URLs can have a country code in them, like this: open.spotify.com/intl-fr/album/<id> (instead of open.spotify.com/album/<id>), but Zotify doesn't handle them yet. Both URLs are working and refere to the same content despite the country code /intl-xx. I couldn't find any official documentation from Spotify about it, and I'm guessing it's added to URLs for accounts localized outside USA. I'm from France and I have it on my browser client, on every page (artists, tracks, etc). While searching about this, I found an issue (fixed) about this on the spotDL repo, and also someone from Deutshland referring to this on Reddit.

I guess it's to make content (un)available per country.

Anyway I added a small part to ignore intl-xx in the Spotify URL RegExp, to be able to just paste URLs for Zotify without manually edit them every time.

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I tried out Zotify locally with my modifications and it seems to be working as expected, here for an URL with a country code:

$ zotify https://open.spotify.com/intl-fr/album/1j1yxsmJ81ZfPWOzC5AE5l

###   Downloaded "Jwles - Marches" to "Jwles/Le Zin & les Autres/01 - Jwles - Marches.ogg" in 0s (plus 0s converting)   ###

###   Downloaded "Jwles - 2001" to "Jwles/Le Zin & les Autres/02 - Jwles - 2001.ogg" in 1s (plus 0s converting)   ###

[...]

100%|██████████████▉| 12.0/12.0 [00:16<00:00, 1.36s/Song]

The URLs without country code still work properly too:

$ zotify https://open.spotify.com/track/640NtvlQqMJfFItSl9Zxbu 

Jwles - ahhhh: 100%|██████████████▉| 2.36M/2.36M [00:00<00:00, 4.63MB/s]

###   Downloaded "Jwles - ahhhh" to "Jwles/ahhhh/Jwles - ahhhh.ogg" in 0s (plus 0s converting)   ###