log: translate column labels at once (
issue5750)
This makes sure that all columns are aligned. getlogcolumns() is hosted by
templatekw so the namespaces module can see it.
i18n/de.po is updated so test-log.t passes with no error. "obsolete:" and
"instability:" are kept untranslated.
#require docutils gettext
$ $TESTDIR/check-gendoc da
checking for parse errors