[FIX] sap.m.MessageBox: MessageBox doesn't show text when it contains
curly bracket

- the text should be given via the setter and not via the property object
  in constructor, because the curly brackets is recognized as data binding
  when given via constructor. Since data binding isn't needed in
  MessageBox, the setter can be used directly to fix the issue

Change-Id: I17f66f172e741ed252fe91bcbd7d17d68de7dc1f
BCP: 1482027787
Merge "[FIX] sap.m.MessageBox: MessageBox doesn't show text when it contains curly bracket"
[INTERNAL] m.InputBase: formatting improvements

Change-Id: I7a928a9c50f04a019e7f0c14cde79039ea69fe3b