Add on_change_callback to config variables. These callback can be defined in the ConfigVariable object and is called, when the variable is changed.
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
Merge pull request #877 from normanjaeckel/ConfigChangeCallback

Add on_change_callback to config variables. These callback can be define...
Updated DE, FR, CS translation (typo in EN translation string).
Merge pull request #880 from emanuelschuetze/1.4.2-fixes

Translation typo update
Updated English translation file (for new translation string in motion config).
Merge pull request #881 from emanuelschuetze/1.4.2-fixes

Updated English translation file
Updated DE and FR translation (one new translation string).
Merge pull request #882 from emanuelschuetze/translations

Updated translations (de and fr)
Update CHANGELOG and INSTALL for 1.4.2
Merge pull request #885 from normanjaeckel/Prepare1.4.2

Prepare1.4.2
Release 1.4.2
Update version to 1.4.3-dev
Merge pull request #886 from normanjaeckel/Release_1.4.2

Release 1.4.2
Merge branch 'stable/1.4.x'

Conflicts:
	openslides/__init__.py
Refactored assignments app to use class based views instead of
functions.
Merge pull request #879 from DebVortex/feature/refactor-assignments

Refactored assignments app.