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

this fixes gorhill#875

ligatus ad: https://forums.lanik.us/viewtopic.php?f=91&t=24315&start=30

more sensible var naming

new revision

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

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

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

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

minor code review