You will need a configuration file to specified the language. As example:
<Configuration>
<Add SourcePath="\Server\Share"
OfficeClientEdition="32"
Channel="SemiAnnual" >
<Product ID="O365BusinessRetail">
<Language ID="en-us" />
<Language ID="ja-jp" />
</Product>
</Add>
<Updates Enabled="TRUE"
UpdatePath="\Server\Share" />
<Display Level="None" AcceptEULA="TRUE" />
</Configuration>
To install Windows 365 business, you can run the following command:
setup.exe /configure configuration.xml