In version 2.11.5.x there's an invisible Byte Order Mark character at the beginning of the Swedish language file (Windows Notepad inserts this character - never use that application for editing UTF-8 files!). This causes PMA to display a blank page or the "Headers already sent" error message if error_reporting is enabled.
This patch fixes this issue.
Patch (contains invisible UTF-8 characters!)
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Merged in subversion, thanks.