lang

The editor is available in three languages: English (en), spanish (es) and catalan (ca).

In order to change the language you have to set the 2 letter ISO language code to the configuration:

() => {
  const config = {
    lang: 'es',
  }
  const [editorState, setEditorState] = React.useState(
    MUIEditorState.createEmpty(config),
  )
  const onChange = newState => {
    setEditorState(newState)
  }
  return (
    <MUIEditor
      editorState={editorState}
      onChange={onChange}
      config={config}
    />
  )
}

() => {
  const config = {
    lang: 'es',
  }
  const [editorState, setEditorState] = React.useState(
    MUIEditorState.createEmpty(config),
  )
  const onChange = newState => {
    setEditorState(newState)
  }
  return (
    <MUIEditor
      editorState={editorState}
      onChange={onChange}
      config={config}
    />
  )
}

You can edit the code above and try other languages.