Before Embedded Wizard version 13 this attribute was used to control localization of a class or class variant member.

The attribute MultiLingual has determined, how objects of the particular class should behave when the language is changed at the runtime. In the broadest sense, this attribute permitted a GUI component to update itself automatically when language is changed without the necessity to implement this behavior explicitly. For this purpose the attribute had to be configured with the value true.

With the version 13 the attribute MultiLingual has been declared as deprecated. Accordingly, this attribute is not listed anymore in the Inspector window when you have selected a class or class variant member. From now, all classes and class variants are considered as multi-lingual by default (as if the attribute were set true). See also React automatically to language selection.