CSV characters should not be translated

Summary: These characters are used in CSV format and should not change. So they should not be translated. What's more, \r will cause warning in GNU Gettext.

Reviewers: #calligra:_3.0, danders, mecir!, boemann

Reviewed By: #calligra:_3.0, danders, boemann

Subscribers: boemann, Calligra-Devel-list, anthonyfieroni

Tags: #calligra:_3.0

Differential Revision: https://phabricator.kde.org/D7946