Limit Mockup display to the current language

[KeyWorksRW]

Description:

Using a static text control with markup text and the markup property checked, looks like it works fine in the Mockup panel on Windows. However, it's actually only available for C++. This is one of the most noticeable cases where Mockup looks correct for one language, but not for others.

Each generator that implements a widget that isn't available in the preferred language either should not display it at all or display a static text indicating that the control is unavailable in the preferred language.