5.1.20.6

Final Change for 5.1.20.6

[add] Greek Translation by twilight0
[upd] Italian translation by DjDiabolik
[fix] Typos in German translation by philippbeckmann
[fix] Typos in addon.xml -- jdf
[upd] Reworked main page just a little bit. took out donation work since it's no longer maintained by bromix.
[upd] Minor clarification and typo fixes -- twilight0
[upd] Store region separately from language -- leonghui
[add] Activate sorting method DateAdded -- h0d3nt3uf3l
[add] Added functions to fill variables -- h0d3nt3uf3l
[fix] Fixed Sorting list with playlists and My Subscriptions -- h0d3nt3uf3l