Other Languages Dropdown in footer will contain all supported languages on the site.
A language is supported if there is at least one version of FF translated
If a user selects a version using the version switcher for which there is no translation:
Display Option: Documentation for {ff version} is not available in {current user selected language}, View English Version
Display Option: Directly display english version with a message "Documentation for {ff version} is not available in {current user selected language}, You are currently viewing the English version"