fix(lang,notifications) make join notification text more generic

lang/main.json

     "me": "me",
     "notify": {
         "connectedOneMember": "{{name}} joined the meeting",
-        "connectedThreePlusMembers": "{{name}} and {{count}} others joined the meeting",
+        "connectedThreePlusMembers": "{{name}} and many others joined the meeting",
         "connectedTwoMembers": "{{first}} and {{second}} joined the meeting",
         "disconnected": "disconnected",
         "focus": "Conference focus",

react/features/notifications/actions.js

     if (joinedParticipantsCount >= 3) {
         notificationProps = {
             titleArguments: {
-                name: joinedParticipantsNames[0],
-                count: joinedParticipantsCount - 1
+                name: joinedParticipantsNames[0]
             },
             titleKey: 'notify.connectedThreePlusMembers'
         };