Hi,
There are two different properties related to languages. The first one is this one:
http://www.essentialobjects.com/doc/6/eo.webbrowser.runtime.uilanguage.aspxThis one affects the language used in the UI elements. For example, if you set this property to "es", then the title of a JavaScript alert message box will be in Spanish. See here for more details about this property:
http://www.essentialobjects.com/doc/6/customize/localization.aspxThe default value for this property is your current OS language.
Another property is this one:
http://www.essentialobjects.com/doc/6/eo.webbrowser.webview.acceptlanguage.aspxThis property controls the "Accept-Language" HTTP header that is sent from EO.WebBrowser to the server. The server can examine this value and acts accordingly or it can ignore it completely. For example, Google examines this value and if you set it to "de-DE" and load Google's home page, then the German version of Google's homepage will be loaded. However our website is only in English, so it does not examine this value so no matter what value you set, you will always load the English version of our website.
Hope this helps. Please feel free to let us know if you still have any more questions.
Thanks!