Update res/values-de/strings.xml

Changed advanced preferences (DE) to reflect Android design guides
Update res/values-de/strings.xml

More changes towards Android Design Guide
Update src/com/decad3nce/aegis/PhoneTrackerActivity.java

Localized two strings
Added two new strings
Merge branch 'untranslated-strings' of github.com:pgschk/Aegis into untranslated-strings
Update res/values-de/strings.xml
Merge pull request #45 from pgschk/german-translation

Updated DE translation to be closer to Android Design Guide
Merge pull request #46 from pgschk/untranslated-strings

Untranslated strings in PhoneTrackerActivity.java