Fix to work without the language key of the default language within the URL.

Without this fix the language key has to be a part of the URL in any case.

1. Setup:
---------
        ...
// Language configuration
        array(
            "GETvar" => "L",
            "valueMap" => array(
                // id"s need to line up with Website Language Ids in TYPO3
//                "de" => "0", // Do not configure the default language here. It generates the default language to be in the URL like /de/... . That means doublicate Content as well.
                "en" => "1",
            ),
            "valueDefault" => "de",
            "noMatch" => "bypass",
        ),
...

2. Setup:
---------
        ...
// Language configuration
        array(
            "GETvar" => "L",
            "valueMap" => array(
                "de" => "0",
                "en" => "1",
            ),
            "valueDefault" => "de",
            "noMatch" => "bypass",
        ),
...

The fix should work for both setups.