fix(welcome-page): Change text

lang/main.json

         "roomnameHint": "Enter the name or URL of the room you want to join. You may make a name up, just let the people you are meeting know it so that they enter the same name.",
         "sendFeedback": "Send feedback",
         "terms": "Terms",
-        "title": "More secure, more flexible, and completely free video conferencing."
+        "title": "Secure, fully featured, and completely free video conferencing"
     },
     "startupoverlay": {
         "policyText": " ",