Merge pull request #869 from emanuelschuetze/1.4.2-fixes

Fixes for motion version and identifier
Fix delete of assignments with related agenda items.
Merge pull request #873 from normanjaeckel/FixDeleteAssignment

Fix delete of assignments with related agenda items.
Fixed wrong ordering of agenda items after order change

Fixed #875
Merge pull request #878 from ostcar/change_agenda_items

Fixed wrong ordering of agenda items after order change
Updated DE, FR, CS translation (typo in EN translation string).