Fixed UI of return view and fixed button behaviour
Merge remote-tracking branch 'upstream/develop' into issue#434-fix_return
Pre commit
Merge remote-tracking branch 'upstream/develop' into issue#434-fix_return
Merge branch 'instant_manual_lending' into issue#434-fix_return

Conflicts:
	src/main/java/de/dhbw/humbuch/view/LendingView.java
	src/main/java/de/dhbw/humbuch/view/components/StudentMaterialSelector.java
Clean up before pull request
Merge pull request #471 from henningmu/issue#434-fix_return

Issue#434 fix return