Translate weekdays

In the timetable the weekdays are not yet translated.

added part::i18n type::bug workflow::discussing labels

added prio::2 label

assigned to @ZugBahnHof

created merge request !85 (merged) to address this issue

mentioned in merge request !85 (merged)

assigned to @hansegucker and unassigned @ZugBahnHof

closed with merge request !85 (merged)

mentioned in commit 33526e50