translation of comments and some other german terms

launch.html

@@ -31,8 +31,8 @@
         </svg>
       </button>
       <div id="navActions" class="nav-actions">
-      <a class="button secondary" href="https://www.bnvb-ingenieure.de/impressum" target="_blank" rel="noopener noreferrer" data-i18n="impressum">
-        Impressum
+      <a class="button secondary" href="https://www.bnvb-ingenieure.de/impressum" target="_blank" rel="noopener noreferrer" data-i18n="legal_notice">
+        Legal Notice
       </a>
       <a class="button secondary" href="https://git.bnvb.eu/stefan.tollkuehn/jitsi-launch" target="_blank" rel="noopener noreferrer" data-i18n="source">
         Source