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"You were mentioned in a comment" notifications should show the title of the question
The notifications drop-down shows the question title at least for comments that don't specifically ping you, and for answers to your own questions.
However, if you're "mentioned" (pinged) in a comment, the notification only says "You were mentioned in a comment" and indicates which site that comment is on.
Can the notification text please show at least the title of the question where that comment exists?