Update site.json (Català)

A lot of notes in catalan, tomorrow i'll complete the rest. 

And please, can you put me the catalan flag on Translation contribution list instead of spanish, I will give to you all the support i can translating all the new things into catalan, but spanish isn't my mother tongue and I can not help in the same way.
Merge branch 'patch-3' of https://github.com/Rockbdn/justdelete.me into Rockbdn-patch-3
Add sites.json french translations
Merge branch 'Rockbdn-patch-3'
Fixed merge conflicts
Forgot to merge pulls