The banners are based on the control|variant banner of the previous test.
Acceptance Criteria
- One of last year's banners is revived (see wmde/fundraising-banners@4eb9c61).
- In viewports smaller than 1400px width the form of the variant banner is displayed below the banner text.
- The form breaks into two (or more) rows when the viewport is too small.
- Error message containers are changed to resemble the look in the control banner.