Merge branch 'master' into '11-refactor-home-to-comply-with-a11y-requirements'

# Conflicts:
#   src/app/app.component.html
#   src/app/components/shared/footer/footer.component.html
#   src/app/components/shared/footer/footer.component.ts
#   src/app/components/shared/header/header.component.html
#   src/assets/i18n/home/de.json
#   src/assets/i18n/home/en.json
#   src/styles.scss
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