[BUGFIX] 1643 MailQueue: Fix template filter pagination

See merge request !27

[BUGFIX] 1683 Fix Newsletter groups selection for clone groups

See merge request !25

- Template filter
- Language Filter
- CSV Export

[BUGFIX] Fix the BC introduced by renaming the form finishers, also remove the default mail finishers

Feature 2251 finisher labels

See merge request !24

MailToSenderFinisher -> MailToUserFinisher
MailToReceiverFinisher -> MailToAdminFinisher
userName -> mailFromName

fix an issue that was introduced in my previous commit ac5026b5, where i moved the parent:saveFormAction to the bottom of our overriden saveFormAction, in order to save modified values back to the form defitinion. if a form has none of our finishers attached, the action is returns without calling the parentAction.

Feature 2251 mail changes

See merge request !22

[BUGFIX] 1584 fix contact form placeholders

See merge request !23