HelpDocs supports right-to-left (RTL) languages such as Arabic, and regional variants of a language such as UK English or Canadian French. This article explains how each one works. To turn on multilingual publishing and add your languages, see Setting Up Multilingual.
Regional language variants
Some languages have regional variants. Languages with regional variants show an arrow in the language list. Hover over the arrow to pick a locale such as en-GB, or type the locale's name or code to find it.
Right-to-left languages
If you add a right-to-left language such as Arabic, HelpDocs tells you whether your template fully supports right-to-left layouts.
You can always write articles in right-to-left languages. On some templates, however, the page layout stays left-to-right unless you customize it.