l10n: de.po: translate "revision" consistently as "Revision"

In the current German translation, the word "revision" was
translated as both "Version" (translation of "commit") and
"Revision". Since a revision in Git is not necessarily a
commit, we should not translate it with the same word in
order to give the user a hint that it's not necessarily
the same. After this commit, "revision" is consistently
translated as "Revision".

Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
l10n: de.po: translate "reset" as "neu setzen"

According to the glossary, "reset" should be
translated as "neu setzen" but in a couple of
messages we've translated it as "zurücksetzen".
This fixes that.

Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>