[Commotion-admin] [commotion-translation-generator] Check for string duplication in the PO header lines (#7)

[critzo]

Generated PO files contain a couple of duplicated lines in the header lines relating to the contributing translators. 

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/commotion-translation-generator/issues/7
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