Merge branch 'master' into milestone-DueDate-optional_240
add check again if gitea is older than 1.10.0 ...
Crowdin [2020-01-04] + add Latvian (#253)
update Translators
add Latvian
update Crowdin
Co-authored-by: 6543 <6543@obermui.de>
make DueDate optional on MilestoneCreaton
Co-authored-by: 6543 <6543@obermui.de>