Steps to reproduce
Browse > Collections > New Collection
Fill in the form to create a new gift exchange with a title that will cause the error
Use a < in the "Display title" field, e.g. "Gifts You'll <3"
For "Type of challenge, if any," select "Gift Exchange"
On the challenge settings page, set up the gift exchange so sign-ups will be visible
Check "Requests visible?"
If you follow any of these links in the collection sidebar, you'll notice the heading uses < in the collection name:
Subcollections says, "Challenges/Subcollections in Gifts You'll <3"
Sign-up Form says, "Sign Up for Gifts You'll <3"
Sign-ups says, "Sign-ups for Gifts You'll <3"
Sign-up Summary says, "Sign-up Summary for Gifts You'll <3"
Requests Summary says, "Prompts for Gifts You'll <3"
Matching says, "Matching for Gifts You'll <3"
People says, "Participants in Gifts You'll <3"
Challenge Settings says, "Setting Up the Gifts You'll <3 Gift Exchange"
What should happen
The < should be a <.