Add contact link in footer (VPU/Apps/Signature#7)

packages/app-shell/src/app-shell.js

@@ -737,6 +737,7 @@ export class AppShell extends ScopedElementsMixin(LitElement) {
                 <footer>
                     <a target="_blank" rel="noopener" class="int-link-external" href="https://datenschutz.tugraz.at/erklaerung/">${i18n.t('privacy-policy')}</a>
                     <a target="_blank" rel="noopener" class="int-link-external" href="${imprintUrl}">${i18n.t('imprint')}</a>
+                    <a rel="noopener" class="int-link-external" href="mailto:it-support@tugraz.at">${i18n.t('contact')}</a>
                     <vpu-build-info class="${prodClassMap}"></vpu-build-info>
                 </footer>
             </div>

packages/app-shell/src/i18n/de/translation.json

@@ -6,6 +6,7 @@
   },
   "privacy-policy": "Datenschutz",
   "imprint": "Impressum",
+  "contact": "Kontakt",
   "page-updated-needs-reload": "Die Applikation wurde aktualisiert. Bitte laden Sie die Seite neu.",
   "activity-example": {
     "hello-world": "Hallo Welt"

packages/app-shell/src/i18n/en/translation.json

@@ -6,6 +6,7 @@
   },
   "privacy-policy": "Privacy Policy",
   "imprint": "Legal Notice",
+  "contact": "Contact",
   "page-updated-needs-reload": "The application has been updated. Please reload the page.",
   "activity-example": {
     "hello-world": "Hello World"