add locale strings for android version
updated
add script to remove empty localizations
update backup database version 3
update database schema
bug fix: use 'null' for quoteString(null)
bug fix: compile error
ver 6.0.0 (57) beta
Merge branch 'features/backup-v3' into develop
update locales
updated
update copyrighted year
update xib version
update update notes
Merge branch 'develop' : ver 6.0.0