Fixed broken installation
Updated Farsi translation
2.8.14 -> 2.8.15
Prepare release
2.8.15 -> 2.8.16
Fixed restore from backup
Fixed broken FAQ deletion, closes #917
Fetch blocked users as well (#919)
Don't try to send empty notification mails, closes #924
Fixed broken PDF export for Slovak, Czech, Turkish and possible other languages, closes #769 and #867
Merge branch '2.8' into 2.9