Confirm received reinforcements

I would suggest that the message about found supply crates can only be closed with a click on the OK button and not when clicking anywhere on the map.

Because if you're doing any click in the approximate moment when the supply province will be conquered, then the message just pops up only very shortly and disappears immediately.

Or when you conquer the province while you're off. The message always appears a bit delayed after log in, and if you don't think at it and click the newspaper or something else or just move the map, then the message unintentionally is away.