feat: update item language selector

[LeoniePeters]

• Refactor ItemLanguageSelector template into one dropdown
  • Redirects to login before showing the dropdown (clicking the toggle button)
  • When language is selected it mentions the language in the toggle button and adds an option to the dropdown to remove the selected language
  • Mobile: no text and status indicator up to small breakpoint
  • When there is an error, the dropdown is disabled and there is a helptext underneath
• Moves the updated ItemLanguageSelector component down the item page
• Refactor swiper-height SCSS mixin
  • Renamed to media-viewer-height
  • no longer needs to account for extra height when closing the language selector
  • adds the height available now the language selector is moved down to the media-viewer-height (3.5rem)
  • Extended with styles to prevent feedback button overlap
• Use media-viewer-height mixin for embeds
• Adds ItemLanguageSelector to the style guide

[github-actions]

JIRA ticket: EC-6948

[github-actions]

Preview deployment: https://pr-2480.portal-js.dev.eanadev.org/

[github-actions]

Style guide deployment: https://pr-2480.styleguide.dev.eanadev.org/

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud