Yes you can.
When you display steps of RL-ONLINE-CATALOGUE's function on your Rainbow-Link Control panel in single-byte language and input contents in multi-byte language, you can display contents in multi-byte language.
When your visiter sets their browser-language-settings in single-byte langueage, FAQ-contents and contact-form-categories an d contact-form-subjects written in multi-byte language on your RL-ONLINE-CATALOGUE are not displayed. In this case, your visiter sets their browser-language-settings in single-byte langueage can display contents written in multi-byte language by changing their browser-language-settings as multi-byte language. ( 
SEE What's new of RainbowLink Inc. )