"Dev message" in a pop-up shown when renaming a schema from uppercase to lowercase

Steps to reproduce:

• Access to Nuxeo Studio
• Create a Schema called Celebrities (first letter uppercase)
• Add a field, e.g.:
  • name String - multivalued
• Save your schema
• Try to rename the Schema from Celebrities to celebrities

The application shows a pop-up with this message:

com.google.gwt.sharedhtml.OnlyToBeUsedInGeneratedCodeStringBlesedAsSafeHtm
I@d43137e4