This is intended to improve the reading experience of users who speak more than 1 language, primarily for those users whose primary language has limited content. It is quite common for such a user to want to see if the article in another language has more content or is more understandable.
As a user I want to see what other languages an article is available in without scrolling to the bottom of the article.
Desktop will just have another article action and save vertical space
 Implement treatment of button and its placement
[x] It works in ResourceLoader impaired and <noscript> UAs.
 When in force sampled in Schema:MobileWebLanguageSwitcher logging should result in the button's tap having a languageButtonVersion distinct from the existing 'bottom-of-article' value.
 It has ATDD tests.
[x] It works on localhost.
[x] it is deployed at 100% in beta on the prod cluster and beta cluster.
[x] Show an opaque language switcher button (rather than hiding it) when no languages are available.
[x] Align the leftmost icon with the left of the page, and rightmost icon with the right of the page (no spaces) on a small screen.