QmlDesigner: Export RewriterException

Change-Id: I292a974647cc720279ad678426db90f77816a777
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner: Add helper functions for translated text

Change-Id: Ib5b5037f492f7f7ee448aebd5215d28e0ccae7f0
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>