Update lt_LT.ts

Lithuanian translation update
Merge pull request #391 from embar-/1.5-dev

Update lt_LT.ts
update Serbian translation
Update Italian translation by Daniele Di Pisa.
Updated Korean localization by panho10
Update Czech translation by Vít Pelčák.
update of Slovak translation
Merge pull request #393 from zdenop/sk_SK

update of Slovak translation
Add Qt own translation files for version 4.8.5 to be able to translate all base texts. These files are not listed in goldendict.pro file because doing that would mean that every time we call lupdate goldendict.pro all texts would be marked as obsolete because they are not part of GoldenDict codebase. The same thing (and for the same reason) would happen if we add only the needed text from qt_*.ts to Goldendict's own translation files. So we have to find a way to be able to generate the qt_*.qm files during the build and deploy phases.
Update Ukrainian translation by Korostil Daniel.
Add Qt Lithuanian translation
Update Qt Italian translation