Issue #371 - Handle crowdin sync in adblockplusui using Crowdin CLI

All related information is in #371 (closed).

Just in case: if you need access to the Crowdin test project to test this out, let me know, but so far I have tested and seem to looks fine, the only annoying thing is that new script reorganizes translation files differently and it will be harder to review the changes after downloading translations for the first time.