Remove redundant, untranslated banner label

[aduth]

🛠 Summary of changes

Removes the "banner" hard-coded label assigned to the site's banner header.

Why?

• As a user of assistive technology, I expect that labels would be used to provide additional detail beyond a landmark's semantic default and would not otherwise be assigned, so that I am not exposed to duplicate / redundant information
• As a user of assistive technology browsing Login.gov in a language other than English, I expect that labels would be translated in the page's current language, so that I am not confused by labels read in a different language

Related resources:

• https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/banner_role
• https://www.w3.org/TR/wai-aria-1.2/#banner
• https://www.w3.org/WAI/WCAG21/Understanding/language-of-page

📜 Testing Plan

• Ensure that you can navigate to the banner landmark with assistive technology in English and non-English locales

👀 Screenshots

English:

Observe that "banner" is only shown once.

Before	After

French:

Observe that the English word "banner" is no longer present.

Before	After