Move language/theme detection to MainRouter [5.3.0-B1]

In the In-Portal 5.3.x the rewrite listeners concept was transformed into router concept, which allows to encapsulate all unit-related url processing logic into dedicated class. It turns out however, that kRewriteUrlProcessor is still doing detection of language/theme from url instead of MainRouter class, that adds them to built urls.

Solution

Move language/theme detection code to the MainRouter class.

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