fix: footer accessibility problems

[virus-rpi]

Changes:

• On mobile or narrow screens the text size of the language switcher and the legal links are increased from 14px to 18px
• Add a aria-label to the language switcher ("Sprachauswahl" / "Language selection")
• State that the social links will open a new tab in the aria-label (https://www.a11yproject.com/checklist/#identify-links-that-open-in-a-new-tab-or-window)
• Converted the elements in the legal links list to
• elements (Improves the Lighthouse accessibility score => better SEO)

[netlify]

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Lighthouse	1 paths audited Performance: 76 (🔴 down 18 from production) Accessibility: 100 (🟢 up 3 from production) Best Practices: 100 (no change from production) SEO: 86 (no change from production) PWA: 80 (no change from production) View the detailed breakdown and full score reports

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[maxmarkus]

Looks fine so far, just some small remarks.

[maxmarkus]

LGTM, thank you for the changes.