Hello,
1. Likely you simply need to synchronize translation files.
Button Sync (Loco Translate plugin http://prntscr.com/glemdq) allows you to synchronize your translation file with updated pot file. It means if we made any changes in template files that may affect transaltion or we added new string for the translation and you updated theme you need to synchronize your translation with updated files. Only after synchronization, you’ll be able to translate new strings or strings that were changed.
Also, don’t forget to backup all the files before any update.
2. By default, there is no such possibility.
If you need help with additional customization contact WP-Kraken team.
3. Please see screenhots http://prntscr.com/j4np37 > http://prntscr.com/j4nous > http://prntscr.com/j4npat and http://prntscr.com/j4nphv > http://prntscr.com/j4npnc
Regards