I found this special Arabic-German dictionary online:
It focusses on very common words/phrases that you need to know when you get in contact with German or Arabic speakers for the first time.
The other two chapters work in the same way, but they are about getting in contact with authorities and doctors.
Especially the first chapter should be useful for locals and refugees that want to get to know each other without having had any contact before.
Unfortunately it is only an extract of a longer book (that you have to buy), but it is a nice way to start.