[BUGFIX] Partial fix for all the language issues. At least take a proper ico code instead of a complete obscure language value.

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

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).

- Template filter
- Language Filter
- CSV Export