How does the Help Center determine what language to display for an article when a user accesses the Help Center?
Every web browser has a language setting that is automatically detected when a user visits the Help Center. If the article has been translated into that language, the Help Center displays the article in that language. If the language is not supported in the Help Center, the “default” language is used. For example, if someone has their browser language set to Swahili and your Help Center does not have Swahili as a supported language, they'll see the article in the default language.
For more information on how content is served in the Help Center, depending on the language settings and the translated content available, see the article: Understanding how translated content is displayed in your Help Center.