See the table below for supported language codes. The language code IS case sensitive.
lng (Language Code)
United States English (default)
When providing Atom content via a hosted webview, you can set the page language with the
lng query parameter. For example, to display the page content in Brazilian Portuguese, you can append
?lng=pt-BR to the page URL. The most recently used language will be saved as a cookie for subsequent page views.
lng parameter isn't used, the site will try to autodetect the language from the user's browser. If the detected language isn't available,
en-US is used by default.