Hi and WELCOME!!
Learn french it will help in many different ways and make you feel more "at home" and make sure you do it straight away,it will also help you make friends! German will help you also in day to day life i hear it spoken now and again.
Ok so as crime goes i think there is no worry there,coming from south east england, to me switzerland seems very safe. As crime goes you will notice people just leaving their bikes,unlocked at the train stations etc. No massive padlocks and chains then the frame stolen and you left with just the wheel!!

well i don't know statistics but this is just my observation.
If you are already here.......enjoy as the summer is in full swing and there is plenty going on! The swiss are quite forward in the respect of speaking and just making general conversation, (well the handful that i know or have met.) so i assume that they like "us"

Good luck hope this helped a little.