Every text string for WordPress core, plugins, and themes must be translated if an admin decides to run a non-English website. For the WordPress core and the vast majority of plugins and themes, all strings are initially in (US) English. If someone uses WordPress without any language packs, that’s exactly what you’d see.
In most European countries, however, using WordPress in a language other than English is common. To accommodate this fact, WordPress downloads language packs in the background created by volunteers. If a language pack is incomplete or a specific plugin doesn’t have one, WordPress automatically falls back to displaying the (usually) English original.
This is where Pascal Birchler’s Preferred Languages plugin comes into play.
Continue reading