Fix filename format in ExportMessagesDialog #698

Job	Run time
call-pr-workflow / changes	4s
call-pr-workflow / wrapper-validation	8s
call-pr-workflow / test	3m 4s
call-pr-workflow / detekt	1m 53s
call-pr-workflow / lint	4m 34s
call-pr-workflow / ci-gate	4s
	9m 47s

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