make lt/ht translatable=false

Change-Id: Ib526750e82d09393b3d85c5bdd97079a432403a1
add Italian translation by entony80

Change-Id: I6dbdefc0e81223b6e8d0cad9f5ab59ea14bb377c
Update strings.xml

Fix
cleanup
misc updates

-Refactor the code to be more readable
-Modernize the UI
-Remove useless files

...and some more.

Change-Id: I6b1d2a33fb5e84110d5aafe976f05f3f40de29d0

Conflicts:
	AndroidManifest.xml
	project.properties
	res/drawable-ldpi/icon.png
	res/drawable-mdpi/icon.png
	res/values/strings.xml
	src/de/yanniks/sensor/PSCalibrator.java