Development team celebrate Silver wedding with the programming language that is adapted to, hopefully, over the decades, and not only Software, but also developed in-house. Otherwise, either your customers or they themselves are likely to remain on the track.
Help with the Translation urgently sought
The only prerequisite for a profitable use of the knowledge of the English language. Users who visit the page, however, the language based on your browser setting addresses assigned, and in case of doubt, ask for help: “Your Browser will tell us, that you come from Germany. Could you help us with the Translation of the tutorial to German?“ The one likes a pushy, the other smart find. In addition to the English language this Tutorial can be used in Spanish, Russian, Turkish, Arabic, Japanese, Korean, and traditional Chinese.
Who does not want to call the Tutorial on the Web, but for example in an Intranet or local deploy on GitHub a Server Version.