https://www.progress.com/documentation/sitefinity-cms/102/multiple-site-management-in-multilingual-mode
Multiple site management in multilingual mode - Sitefinity CMS Multisite
If your sites have different languages, configure the languages of each site when you create it or edit the languages of all of your sites at once.
site managementmultilingual modesitefinity cmsmultiplemultisite
https://dev.wix.com/docs/api-reference/business-management/multilingual/locale-management/locale-settings/set-multilingual-mode?apiView=SDK
Set Multilingual Mode | API Reference
Sets a site's multilingual mode. Multilingual mode allows a site to support multiple locales. This means that when multilingual mode is enabled, you can create...
multilingual modeapi referenceset