The official Ubuntu documentation is available at https://help.ubuntu.com/. Curiously, it automatically displays the content in the locale that the user's browser provides, without any option to change the language. For example, currently when I open the URL https://help.ubuntu.com/lts/serverguide/cups.html, it's automatically in German, but I'd like to read it in English. How may I do it?
As of 2017-10-12, there is no nice way via the user interface. There is a bug report asking for a way, bug #1532537. Please add yourself to the list of affected people.
You can call the webpage with the language of your choice by appending
.<language code> to the URL. Examples:
As workaround, Firefox have a nice addon that let switch locale quickly.
Quick Accept-Language Switcher by Dan Callahan
Provides a quick way of changing the HTTP Accept-Language header so you can view and test websites with a different locale.
Another one which seems better as you can set it permanently per site basis.
HeaderControlRevived by Torvin
Provides control over HTTP headers (User-Agent, Referer and Accept-Language) on a per-site basis.