Description:
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If users use a direct link to enter one of pseudotranslated versions of documentation, the JS-based language selection is set to "English" and prevents them from switching to english. It is required first to switch to some other language and only then it is possible to set english.

Tested on: Fx-27.0.1 on Arch64, but it doesn't seems to be related to browser or platform.

Note: actually after disabling JS it is not possible to change language at all. But I think a separate bug report should be filled for that after this one is resolved.

Test script:
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1. Enter some pseudotranslated documentation page. Example: <http://php.net/manual/pl/class.datetime.php>
2. Try to switch to english.

Expected result:
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Ability to switch to english without a need to switch to some other language first.

Actual result:
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One needs to switch to other language before it is possible to switch to english.