add i18n text

src/assets/i18n/creator/de.json

@@ -6,7 +6,7 @@
     "created-2": "' erfolgreich erstellt."
   },
   "room-page": {
-    "comments": "Zu den Fragen",
+    "comments": "Fragen",
     "create-content": "Frage erstellen",
     "live-feedback": "Live Feedback",
     "answer-statistics": "Statistiken",

src/assets/i18n/participant/de.json

@@ -2,6 +2,7 @@
   "home-page": {
     "no-room-found": "Es wurde keine Session mit dieser ID gefunden.",
     "please-enter": "Bitte Session-ID eingeben",
+    "only-numbers": "Eine Session-ID besteht aus Ziffern.",
     "exactly-8": "Eine Session-ID hat genau 8 Ziffern."
   },
   "room-page": {

src/assets/i18n/participant/en.json

@@ -2,7 +2,8 @@
   "home-page": {
     "no-room-found": "No session found with this ID",
     "please-enter": "Please enter a session ID",
-    "exactly-8": "A session ID has exactly 8 digits."
+    "only-numbers": "A session ID is composed of digits only.",
+    "exactly-8": "A session ID is composed of exactly eight digits."
   },
   "room-page": {
     "comments": "Comments",