Change Time Slots and Time Display

Hi there!

After installing, I see pre-configured time slots from 9 am to 7 pm, each 1 hour long, with “Noon” and “Full Day”.

How can I change this to the German Version? (the Translation is there)
And how can I change it to the 24 hr format? (17:00h instead of 5 pm)
Is it possible to take one or more slots out? Like lunchbreak and every slot after 5pm?

I ‘ve seen the video but it doesn’t help, it was probably made for a different version…