App will now save/restore scroll state when creating a new workout. Bugfix: 2 Strings were not translated before.

(scroll state: which items of the ListView are visible).
Bugfix: restoring scroll position did not work if exercises have been filtered by using a search query.

Also added a custom adapter for the ListView in ExerciseTypeListFragment.
ExerciseTypeListFragment: updating the enabled/disabled state of exercises works now properly.
Preparing release v0.5.1
Merge branch 'highlight-selected-exercises'