Designer: fix capitalization of UI text

Change-Id: I082f4a7a7d6c01ae4de2a91abe318d73a931bf9e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Diff Editor: Fix compilation with Qt < 5.2.

Change-Id: I95401ed010e41341eb25bba032b924765b2c1be5
Reviewed-by: Christian Stenger <christian.stenger@digia.com>