Fix typo in German translation: Kontact -> Kontakt (#430)

Author: TobiGr

src/i18n/locales/de.yaml

@@ -388,7 +388,7 @@ footer_add_banner: "Countdown-Banner hinzufügen"
 # [en] footer_sign_petition: "Sign the petition"
 footer_sign_petition: "Petition unterschreiben"
 # [en] footer_contact: "Contact"
-footer_contact: "Kontact"
+footer_contact: "Kontakt"
 # [en] footer_report_issues: "Report site issues"
 footer_report_issues: "Probleme auf der Website melden"
 # [en] footer_translations: "Translations"