How to preview a message with $params?

Thank you Nike. I didn’t know Special:ExpandTemplates.

However, I don’t achieve to give params. In the follwing code, params are not taken into account: {{MediaWiki:Notification-header-mention-status-bundle/fr|aaa|Pols12|5|User talk:Pols12|3|2}}.

The following code work: {{int:Notification-header-mention-status-bundle/fr|Bastard|Pols12|5|User talk:Pols12|3|2}} But, as I explained to Nemo, int: display the real message, and I’d like to test a new translation, not waiting for their daily export.

Pols12 (talk)15:06, 13 April 2018