this fixes gorhill#650; code reviewed changes re. gorhill#1202, gorhi…

…ll#1545; fine tuning picker UI

new revision for release version

this addresses gorhill#1505

this fixes gorhill#1448

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