Yes, you can. If you are experienced with HTML, you may want to do some editing of the HTML file generated by Live 3D when it exports web tours. There are several things you can edit, including the default language, the color of the background, etc.
This is an advanced capability, so make sure you have some HTML experience.
For more details on this process, see Editing the HTML File in Chapter 4, Section 4.8: Export and Editing Options in the User Guide. The User Guide is located in the Help menu of Live 3D.
There is also some useful information on the StrataCafe.com Live 3D CX forum.