release versions are even numbered

this addresses https://forums.lanik.us/viewtopic.php?f=91&t=29267

this fixes gorhill#1448

this fixes gorhill#1444

updated translation stuff for Opera store

this addresses https://forums.lanik.us/viewtopic.php?f=64&t=28700

translation work from https://crowdin.com/project/ublock

code review + fixes another potential error in browser console (re. p…

…opup blocking)

new revision

this fixes gorhill#1204