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V.4
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1. Homepage and Step1: RVsitebuilder interface will display in the same language as cPanel interface (if the language files exist). You can force RVsitebuilder to display in the certain language by setting the default language at RVsitebuilder Manager >> Owner Configuration.

2. Step2 -7: RVsitebuilder interface will show in the same language user choose for the project in step1 (if the language files exist).

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V.5 / V.5.2.x
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1. Step Home: RVsitebuilder interface will display in the same language as cPanel interface (if the language files exist). You can force RVsitebuilder to display in the certain language by setting the default language at RVsitebuilder Manager >> Owner Configuration.
 
2. Step 1-3: RVsitebuilder interface will show in the same language user choose for the project in Step Home (if the language files exist).