Suggestion: Rather than invite the unknowns of an open-ended text input for the "Label" section of an ideas form, provide a droplist.
Rationale: The labels input is mutually exclusive, and less than 100 options: a droplist is the proper UI device for this form element. Currently the input mechanism is a text box. The prompt text is not clear that there is a max of one label (it can be mistakenly be presumed that at least one label is required). Furthermore, when the "Post" button is clicked while the Label field is in an error state, the post button reverts to a disabled state, no error is mentioned, and no indication of success/failure is provided, leaving the user to presume it may have been submitted.