Gets the default language for the web site.
Default value: "en"
This is the default language of all content on the web site.
If multiple sites are specified using the <sites> section of web.config, the current url will be matched against the sites specified in that section.
If a match is found, the language of that site definition is used. Otherwise, the value of the 'DefaultLanguage' setting is used.
Settings Class | Sitecore.Configuration Namespace