Hello to Zurich!
The current German description on Google Play appears to be a machine translation (every line needs correction.) I count only about 2000 characters, so I could either provide a fluent, corrected and more targeted description based on the English description, or if you'd like to use the full 4000 characters, I'd need additional information on what other aspects of the app you'd like to include.
Please feel free to get in touch via chat, greetings from Austria!
******
My name is Nina, I’m 36 years old, native German and live in Austria. Most importantly, I bring more than 15 years of work experience as translator, copy editor and proofreader for print, so I won’t waste your time with “Google translate”, but can provide a quality translation with attention to detail.