Internationalization for validation messages

The validation messages are i18n only if the component is in a Property line.
I have an input text in a static cell and a message component for this input text.
Even if I put a custom validation message for the RegExpr validator, I get the default validation message.
If I put the input text in a property line, the custom error message is displayed.
How can I get the same behavior without using a property line.

Were you able to find a work-around?