On_Select userexit in widget menus/button areas or On_Event userexit in Widget state.
This function works alternately. It can only be usefully applied by customisers. End-users should not have access to this feature, because the title of language fields is only output in the currently selected language end, thus, an unambiguous assignment of language and column cannot be made.
Example:
In DataView the userexit is assigned to the system event [Shift+Ctrl+L].