Poor input validation of Class editor properties

Adding new properties to an class does not really validate the input and results most of the time in a "Failed: Bad Request" if one does stupid things, like

• Try adding the same property twice
• Including a special character like (), in the property name
• Spaces are silently removed

Interestingly, changing an existing property to contain non conforming characters reports the allowed characters in the property name as a warning at the bottom (same as "bad request"), e.g. the checks are already in place somewhere ...

BTW: "Save & View" displays the error differently than "save" only (white page with the same/similar text as the warning at the bottom). "Save & View" will cause your changes to be lost though as going back will go the the previous state of the page ...