Updated translations; added Russian, Ukrainian
Get known image formats from QImage data in QClipboard
Translated using Weblate (Ukrainian)

Currently translated at 0.4% (3 of 607 strings)
Merge remote-tracking branch 'origin/master'
create_source_package.sh checks if version is in CHANGES
Add offset options for notifications
Show "snip" tray icon even for quick command like "toggle"
Fix encoding issue for "config" command
Use UTF8 instead of local system encoding