Thanks to {T64702} the Translate extension can now display language links in the sidebar.
The extensions comes with four configuration options:
* tag-only: Only display languages with the <languages /> tag.
* sidebar-only: Display languages as interlanguage links only and ignore the tag even if present on the page.
* sidebar-fallback: Display languages as interlanguage links if no tag is on the page.
* sidebar-always: Display languages as interlanguage links and also in tag if it is present on the page.
The extension default option is currently tag-only, to preserve current behavior. Let's use this task to discuss whether we want to use one of the other options on Wikimedia sites, and when/how to do it if so.
`sidebar-fallback`:
* is good for testing this on specific pages
* can support pages with both interlanguage links and page translation links
* Currently unavailable due to {T204914}
`sidebar-only`:
* can be used if we want to consistently have the language links in the sidebar
* will mix interlanguage and page translation links together, and compact language links feature will be confused by duplicate language codes