ssh-term - is a Splynx add-on, what had been developed to use terminal in Splynx web-interface.
To install ssh-term add-on use next commands:
apt-get install splynx-ssh-term
or you can install it from Web UI:
Config → Integrations → Add-ons:
after installation you will see a new icon in Config → Tools:
when you'll press on this icon you will see a terminal window, and there you need to enter your login and password and that you will be able to use terminal from Splynx web-interface as from console: