This reverts commit 5b9ee9f1, reversing
changes made to bb6c3845.

[BUGFIX] replace newlines in mail layout too

See merge request !28

Newlines were only replaced with <br>'s in the mail body, but not in the configured layout for this mail. This resulted in missing newlines in the layout (everything was more or less in one line).

[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