Reading/Web/Desktop Improvements/Features/Language switching

As a part of the Desktop Improvements project, we are introducing a new way to switch to a different language wiki. Our goal is to make the language switching functionality easier to find for all users. Our secondary goal is to improve the overall understanding of Wikimedia projects by allowing all readers to learn about the vast numbers of languages available for each project.

Release plan
We will be working on these changes in Q2 of the 2020/2021 fiscal year (October - December 2020) and are hoping to deploy our first iterations in January 2021. We will be deploying the changes by default to our early adopter wikis. The changes will also be available to all logged-in users that have opted into the new experience.

Feature description and requirements

 * 1) Language options will be available via a clearly-marked button on the top of the page, in-line with the article title.
 * 2) Selecting the language button will open the list of languages that will contain the suggested languages for each user, as well as a full list of all available languages for that article.  The list will also contain entry points to language display settings, and language input settings.
 * 3) The original language list will no longer appear on the sidebar
 * 4) The new location of the button will require changes to the header of the page, in particular, some changes to the location of page indicators.
 * 5) We will have a non-JavaScript fallback which will display the full list of all languages for users that do not have JS access