[libreoffice-l10n] extra comments on top of po files

Hello,

While preparing to 4.3 translation, I have
noticed that PO files downloaded from Pootle
contain a comment like this as first line of file

#. extracted from cui/uiconfig/ui

These comments are gone if I save the PO file
with Poedit, for example. Aren't they against the
PO file format?

Is it safe to remove these comments from PO files?

Thanks,

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