Update src/mumble/MainWindow.cpp

Co-authored-by: Davide Beatrici <github@davidebeatrici.dev>

src/mumble/MainWindow.cpp

@@ -3631,7 +3631,7 @@ void MainWindow::serverDisconnected(QAbstractSocket::SocketError err, QString re
  "your client and in the second case you should contact the server administrator so that they can update "
  "their server.</li>"
  "<li>Either your client or the server is using an old operating system that doesn't provide up-to-date "
- "encryption methods. In this case you should consider updating your OS or contact the server admin "
+ "encryption methods. In this case you should consider updating your OS or contacting the server admin "
  "so that they can update theirs.</li>"
  "<li>The server you are connecting to isn't actually a Mumble server. Please ensure that the used server "
  "address really belongs to a Mumble server and not e.g. to a game server.</li>"