Volume changing on jelly bean

[technocolle...@gmail.com]

hi, and thanks for that great apps

When i was using it on gingerbread, pushing the side button on my xperia make the volume of the vario sound louder.
Nonw on jelly bean, i get the ringtone louder, but i can't get the vario sound louder, i have to go in the setting of android... and it's difficult to do so when you're in the air.

Some other glithes i notice:
- error in the french translation: there is "taux de chute maximum" x2, one of them mus be "taux de montée minimum"
- only for the beta version, when i hit the "custom field" buttons, it crash...

And once more, thanks for your work