add proguard config - optimizing code and delete logs
Merge pull request #811 from Catrobat/proguardConfig

add ProGuard config for Optimization and removing Logs
fixes CAT-970 and CAT-654
correct messages from server are shown
Merge pull request #965 from Catrobat/errorCodes#654

Better error messages
Refactor TermsOfUseFragment CAT-1042
Change "Terms of Use" dialog text to Terms of use: little changes
little changeIII
strings.xml modified
changed class names and method names
update

Conflicts:
	catroid/src/org/catrobat/catroid/ui/dialogs/TermsOfUseDialogFragment.java
Refactor TermsOfUseFragment CAT-1042