By default draw.io uses the language of the browser installation. Is it possible to override that setting?

Step-by-step guide

There are menus to change the default language for your browser in two places. At the bottom right of the initial splash screen there is a little "world" icon:

 

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You can select a new language and refresh the page for that to take effect.

The world icon also appears at the right of the menu bar while using the application:

 

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If you want to test a language without persisting the language setting, you can use the lang parameter in the URL following by the two letter country code, e.g.www.draw.io?lang=es.