What is language preference?
Language preference was operationally defined as the most frequently selected language output.
How to set browser Accept language?
Checking your Accept-Language headers
Run the Internationalization Checker on any page, then in the Information panel, look under Request Headers > Accept-Language . See an example using this page.
How does browser language work?
About browser language
Most desktop browsers have settings that allow you to edit your language preference settings. These tell the server what language you prefer for pages and resources that it sends you (separate from the language of the browser user interface).