[fix] commit message of 'make weblate.push.translations'

Fix `\n` issue in the commit message [1] by using multiple `-m` options [2]::

    7d9ffd68 translations     [translations] update messages.pot and messages.po files\nFrom cebc0e39 - 2021-10-04 - Markus Heiser <markus.heiser@darmarIT.de>

[1] https://github.com/searxng/searxng/pull/379#issuecomment-933242702
[2] https://git-scm.com/docs/git-commit#Documentation/git-commit.txt--mltmsggt



Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>