Form block required field error alert message text

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For the first time in awhile when testing a new survey created for a site using the basic form block I happened to see the error alert message for not filling in a required field.

"Oh snap! Please correct the following errors:
Complete required fields *""

For this client I think that "Oh snap!" is a little too casual for the subject matter of the survey. I would like to remove it or change it, but I can't find it in in any of the code. I have scoured all the files relating to the form block and even did a complete content search of the entire Concrete5 installation and DB, I can't find any reference to "Oh snap!"

This is for version 5.6.3.3

Can anyone point me in the right direction?