Setting Browser Language Preferences
In Microsoft Internet Explorer, the preferred language list is located in the Language Preference dialog box. You can add new languages using the Add dialog box.
The representation of languages in the browser’s preferred language list uses two- to five-character ISO standard locale codes made up of a language and country portion. For example, es represents Spanish and ar represents Argentina. A two-letter code represents only a language, without reference to a specific country or territory.
Other browsers have a similar dialog box that enables you to create an ordered list of language preferences.