Added Right-to-Left languages support to most widgets and to the UI Toolkit Gallery.
The following widgets now behave properly in RTL environments: - List Items - Popups - Slider - TextArea - TextField - Button - ProgressBar - Toolbar - Header - Switch
Tabs still need to be reversed. Relayout issues had to be workarounded (QTBUG 35095) for Label and Row. . Fixes: https://bugs.launchpad.net/bugs/1181740.