Use API version 2
Properly handle sync errors thrown from Zotero.HTTP.promise()
Make tag color chooser window wider

Follow-up to d2f028d79
Missed changed from 0cd3a34e14
Fix items tree styling (context rows, attachment pies) in Fx22+
3.1 is now 4.0
Update translators and repotime
Don't clear other tag colors when rename colored tag
Fix error trying to toggle colored tag with no tag

(This should be fixed so that the setting is always removed, though.)
Fix clearing selected tag when removed from last item in view

I somehow broke this in d2f028d797c5c0ae3d77d54a5bbabaa5cd4a961b, though
I'm not sure how.