Fix #11, add buttons for vacation/holiday in internship modal

Change-Id: I49d4ac8c7574b6f092ba56d3abc83cc12f353f44
Signed-off-by: Stephan Giesau <stephan.giesau@de.ibm.com>
Revert "Fix #11, add buttons for vacation/holiday in internship modal"

This reverts commit a9f7c92c5a0bce1e52070be8253c4259291bf392.
Fixes #11, functionality to add vacation/holiday from internship modal
Merge pull request #12 from mb4/master

Fix #11