Don't perform language negotiation redirect, when navigation within the website

In-Portal has a feature (disabled by default), which allows automatically change website language to one, that matches language from "Accept-Language" header, sent by user's browser on first visit.

This way, when user opens http://www.website.tld/ (website on primary language, since no language in url) he is automatically redirected to http://www.website.tld/user-language/index.html.

There is only [b]one major problem[/b]: first visit detection. We presume, that first visit is when no page has been specified = home page.

Since home page url is / instead of /index.html user is redirected to http://www.website.tld/user-language/index.html each time he wants to change language back to primary website language while staying on Home Page.

[b]Solution:[/b]
Instead of redirect on empty url perform redirect only if referer isn't our website (using kHTTPQuery::refererIsOurSite method) in LanguagesItem::Load method (where redirect is made).