As a follow-up for T147942: Move a Flow board is not possible.

In betalabs when a user without 'Flow bots' rights clicks on 'Move' option on a Flow board

• a user is presented with Special:MovePage form
• as a user fills in for a new title and presses 'Move page', the warning is displayed: "flow-board" content is not allowed on page [destination title]

The warning does not provide a correct information to a user. Either 'Move' option should be unavailable for users who are not allowed to move Flow boards or the warning should clearly state why the move is not possible.