Hello Jurgen,
Besides, the form is usually activated automatically in the languages installed in the system once it is activated for one language. For instance, on MI21, I printed in Italian language and the standard texts like plant are translated automatically in Italian.
However, for languages like Lithuanian, although it is installed some elements needs to be re-wroked via SE63. I suppose, this is all the more true when a special language like Z1 is used.
Open for comments/additional feedback if we have left dark areas ...