Add number of potentially affected tasks in this batch set warning:

Add number of tasks in red and bold, if it exceeds let's say 50 tasks

In addition

change the wording of the last question.

Instead of "Better abort?" The text should be

EN: Continue?

DE: Wirklich ausführen?

And then a click on "Yes" should do the change of property all tasks in question and "No" should abort.