edge: Add userMedia.edgeGrantPermissions in lang/main.json

lang/main.json

       "operaGrantPermissions": "Select <b><i>Allow</i></b> when your browser asks for permissions.",
       "iexplorerGrantPermissions": "Select <b><i>OK</i></b> when your browser asks for permissions.",
       "safariGrantPermissions": "Select <b><i>OK</i></b> when your browser asks for permissions.",
-      "nwjsGrantPermissions": "Please grant permissions to use your camera and microphone"
+      "nwjsGrantPermissions": "Please grant permissions to use your camera and microphone",
+      "edgeGrantPermissions": "Select <b><i>Yes</i></b> when your browser asks for permissions."
     },
     "keyboardShortcuts": {
         "keyboardShortcuts": "Keyboard shortcuts",