⚰️(frontend) remove dead code

Introducing Crisp, we removed the menu item for support. I forgot
to remove its i18n content. My bad

src/frontend/src/locales/de/rooms.json

@@ -77,7 +77,6 @@
     "buttonLabel": "",
     "items": {
       "feedbacks": "",
-      "support": "",
       "settings": "",
       "username": "",
       "effects": "",

src/frontend/src/locales/en/rooms.json

@@ -76,7 +76,6 @@
     "buttonLabel": "More Options",
     "items": {
       "feedbacks": "Give us feedbacks",
-      "support": "Get Help on Tchap",
       "settings": "Settings",
       "username": "Update Your Name",
       "effects": "Apply effects",

src/frontend/src/locales/fr/rooms.json

@@ -76,7 +76,6 @@
     "buttonLabel": "Plus d'options",
     "items": {
       "feedbacks": "Partager votre avis",
-      "support": "Obtenir de l'aide sur Tchap",
       "settings": "Paramètres",
       "username": "Choisir votre nom",
       "effects": "Appliquer des effets",