Feature #569 Load/Save Query By Example

Implement possibility to save/load/delete a QBE on a DB.

Signed-off-by: Hugues Peccatte <hugues.peccatte@gmail.com>
Fix unsaved criterias.

Signed-off-by: Hugues Peccatte <hugues.peccatte@gmail.com>
Fix warnings.

Signed-off-by: Hugues Peccatte <hugues.peccatte@gmail.com>
Add confirmation before deletion.

Signed-off-by: Hugues Peccatte <hugues.peccatte@gmail.com>
Add hint to update a search.

Signed-off-by: Hugues Peccatte <hugues.peccatte@gmail.com>
Fix merge conflict

Signed-off-by: Marc Delisle <marc@infomarc.info>
The word "criteria" is already a plural

Signed-off-by: Marc Delisle <marc@infomarc.info>
ChangeLog entry

Signed-off-by: Marc Delisle <marc@infomarc.info>
Update po files
Translated using Weblate (Belarusian)

Currently translated at 31.1% (853 of 2742)
Merge remote-tracking branch 'weblate-master/master'
Fix lost name of saved search.
Update filename of SavedSearch class.

Signed-off-by: Hugues Peccatte <hugues.peccatte@gmail.com>
Add config help for saved QBE searches.

Signed-off-by: Hugues Peccatte <hugues.peccatte@gmail.com>