Many extensions add text element to books, like standard admonition titles, additional options in the taskbar, etc. As many books are written in English, most extensions add the elements in English by default. However, the underlying framework allows other languagues too. Therefore, Dennis den Ouden-van der Horst en Tom van Woudenberg started adding the required multi-language technical implemtation (i18n) into most of our own tools and tools of others, including a set of translations to common languages.
In our own tools, this is implemented in the most-recent published version. For tools from other, we started pull requests which are awaiting approval. Our teachbooks template contains the most up-to-date overview of packages including the updates awaiting approval.
Image from Ætoms, licensed CC BY 4.0
