Bugfix: Spell check
Sport Activity fix: do not print null values

The null values were printed in the Sport Activity description.
The label.comback was missing.
Added a title in the Emergency section

The title is in bold and instructs the user to click on the number
entries below to activate the call.
Better localisation; removed trailing commas
Important Config change

This should have been introduced sooner. Gonna rebase.
Mensa url refresh mechanism fix

A timestamp as a url parameter has been added in order to force
the refresh. Just a caching issue.
Bugfix: hideLoadingMask after the alert message
Switched to two digits app versioning