Updated German and Czech language files.
Merge pull request #1363 from normanjaeckel/Languages

Updated German and Czech language files.
Fixed #1354: Added CKEditor plugin insterpre to README.
Added version numbers of required packages to portable build instruction.
Updated FR translation.
Merge pull request #1365 from emanuelschuetze/fix-1354

Fixed #1354: Added CKEditor plugin insterpre to README.
Merge pull request #1366 from emanuelschuetze/portable-readme

Added version numbers of required packages to portable build instruction...
Merge pull request #1367 from emanuelschuetze/fr-translation

Updated FR translation.
Fixed #1326 (Rearanged assignment pdf table cells to prevent a LayoutError)
Merge pull request #1373 from emanuelschuetze/fix-1326-b

Fixed #1326: Rearranged assignment pdf table cells to prevent a LayoutError.
Updated CHANGELOG.
Release 1.6.1
Update version to 1.6.2-dev
Merge pull request #1368 from normanjaeckel/Release-1.6.1

Release 1.6.1
Merge branch 'stable/1.6.x' into 'master'.

Conflicts:
	CHANGELOG
	openslides/__init__.py
	openslides/assignment/views.py
Added Django's application configuration.

Used customized AppConfig classes in openslides.core, openslides.account,
openslides.projector, openslides.agenda, openslides.motion, openslides.assignment,
openslides.users, openslides.mediafile, openslides.config.

Refactored loading of signals, template signals and slides.