Your browser determines AdBlock's display language. Some browsers allow you to choose the language that the browser and extension interface (menus, options, and so on) is displayed in. With other browsers, the display language is determined by the language your computer system is set to.
On a Windows computer or Chromebook, you can choose the display language. On Mac and Linux, Chrome uses the system language.
For detailed steps, see the section entitled "Change the language of your Chrome browser" in this Chrome Help article: Change Chrome languages and translate web pages
Safari uses the language of the country in which your Mac was purchased, unless you choose a different language.
The Firefox display language can be easily changed using these steps: Use Firefox in another language.
Microsoft Edge defaults to use the same language as your system: Use Microsoft Edge in another language.