How to change the Node-RED WEB language?

Node-RED: v0.19.5
node.js: v8.10.0

Now the Node-RED WEB language is Chinese, how to change to English?

@pangda it uses your browser's preferred language - falling back to English if we don't support that language. You'll need to change your browser's preference.

Hi knolleary, but if I want to add a new translation language? How can I proceed?