Yes, I want to switch the interface language in the application mode. I have a constant which switches interface language. All the menus, forms, print forms are working already. The only thing that doesn't look right yet is the titles of the Command Bar buttons.
I found a workaround and came up with a solution for this problem. In Command Bar I turned off Autofill option. Then on Tab Commands/Standard commands I clicked on the commands that I need and dropped them on the Command Bar. That created new buttons for these commands and placed them on the Command Bar. With these buttons I can work like with regular form elements and control them in any way I want. In my case in event handler OnCreateAtServer I replaced the titles of those buttons.