Merge pull request #4 from haruto/japanese

Add support for Japanese.
2.1
changed screenshot
Added Spanish UI language by ErMasLoko
Merge pull request #5 from ErMasLoko/patch-1

Added Spanish UI language by ErMasLoko
2.2 (added spanish)
refactoring
2.3, additional css rules support
updated changelog
upd polish (json/langs)
german upd (json/lang)
added todo
2.4: Upgrade for Yandex.Translation
misc
misc2
hotfix for 2.4
2.4: hotfix 2
2.4: resolving issues with opera moderators, part 3
2.4 bugfixes for yandex.translation vendor, final
2.4.5: popup position bugfixes