Song book URL update and all formats now uses dataFormatVersion 3
Translate to English files related to models, Db table constants, and
import/export functions of Bookmarks and Labels.
Move deprecated old Bukmak class out of Db to its own method scoped class.
Remove titles from alert dialogs.
Check if there is no bookmarks to backup, and if so, do not initiate bookmark backup.
Merge branch 'feature/bookmark-preventoverwrite' into develop