See https://djangogirls.org/bern for all the details.
Talks and plenaries will be in German, but most of the time you will be working in small groups with a coach, which can be in English, German, French and maybe even other languages... So high level German is certainly not a must.
We expect to have more applicants than places, so it helps both sides if you spend a couple of minutes answering the questions about you and your motivation.
We are also still looking for coaches, so if you know python and have some time, consider becoming a coach!