Merge branch 'hotfix/v0.12.2' into development

Conflicts:
	apps/common/__init__.py
	apps/documents/forms.py
	apps/feedback/__init__.py
	apps/history/__init__.py
	apps/main/__init__.py
	apps/scheduler/api.py
	apps/sources/models.py
	docs/releases/index.rst
	requirements/production.txt
	settings.py
	urls.py

docs/credits/contributors.rst

@@ -69,6 +69,11 @@ Translations
 
   - mic (https://www.transifex.net/accounts/profile/mic/)
 
+* German
+
+  - Tetja Rediske
+  - Tilmann Sittig
+  
 
 Remote access for debugging
 ---------------------------