Fix bug 876508 - Remove l10n for Sunbird - Remove l10n files. r=mschroeder

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extra : rebase_source : 94f4e293efa71ea36f834f1378dd057b0c75c2f5
Fix bug 876508 - Remove l10n for Sunbird - Remove unused dtd entries. r=mschroeder

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extra : rebase_source : 8ee1d912f5f06f654403e14cb42202dba82c9cc9