[RBrowser] Garbled output at prompt

Special characters in command outputs are displayed garbled in RBrowser, e.g.:

![image](https://user-images.githubusercontent.com/10999034/161717367-4185a5d0-6588-4a3a-9a92-b71697f9905a.png)
