Missing CSRF token causes warning that the content will be executed in restricted mode to be displayed in some unexpected places

Steps to reproduce

1. Login as Admin
2. Go to Administer Wiki > Look & Feel > Image Styles
3. Fill a New Image Style name
4. Click "Create the image style"

Expected results

No warning is displayed on the top of the page.

Actual results

The following warning is displayed:

Warning: For security reasons, the content of the edited document is executed in restricted mode, as the edit was not initiated by a validated request. There may be unexpected errors due to this