Sourced from Wikipedia, Jan 2018. See https://meta.wikimedia.org/wiki/List_of_Wikipedias
Languages are ordered by the number of articles in Wikipedia, which is roughly in order of how widely the language is used on the web (although countries like China which filter sites like Wikipedia may be unfairly demoted in this list).
List is tab-separated. This can be imported into Excel, Google Sheets, or converted to JSON using search-and-replace.