Steps to reproduce (assumes ChromeVox or similar)

1. Open /app/kibana#/management/spaces
2. Tab to "Create Space (button)"
3. Enter
4. Tab to "Name with hint 'Awesome space'" and enter a name
5. Tab to "Customize"
6. Enter

Actual Result

"Initials (2 max) (button)"

Expected Result

"Initials (2 max) (edit text)"

It looks like the tab order gets a little confused because this form label is a button.

Kibana Version: 6.5
Relevant WCAG Criteria: 3.2.1 Predictable on Focus https://www.w3.org/WAI/WCAG21/quickref/#on-focus

Meta-Issue: #25512