Sensor changes

List of changes:

* Inversion of x_orienation
* x_orientation renamed to x_inclination
* y_orienation renamed to y_inclination
* z_orientation renamed to compass_direction
* german translations added for new sensor names
* Changed assertion-error-explanations in SensorTest.java
* Replaced old sensor-names(azimuth, pitch, roll) with current names

Jenkins testrun:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-test/699/