Bugs in settings

[Sebastian1515]

In the settings menu there are some false texts and translations over the forms. (E.g. lang_opening_days_version instead of version)

[Sebastian1515]

Problem with lang_opening_days_0 still exists.

[moan0s]

As mentioned in #83 settings is still full of bugs. This issue can be used as a list of things to fix

• Labels
• Entries being set to null