clarkwinkelmann
I have the same thing for "mentioned you in" in :
./vendor/flarum/mentions/src/Notification/UserMentionedBlueprint.php
./vendor/flarum/mentions/views/emails/userMentioned.blade.php
./vendor/fof/pretty-mail/resources/defaults/userMentioned.blade.php
I will try to report the information on GitHub.
Edit: "replied to your post"
In
./vendor/flarum/mentions/src/Notification/PostMentionedBlueprint.php
./vendor/flarum/mentions/views/emails/postMentioned.blade.php