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This class implements functionality for manipulation of po file headers. This class is a mix-in class and useless on its own. It must be used from all classes which represent a po file
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 create a header for the given filename. arguments are specially handled, kwargs added as key: value pot_creation_date can be None (current date) or a value (datetime or string) po_revision_date can be None (form), False (=pot_creation_date), True (=now), or a value (datetime or string) 
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 Returns the header element, or None. Only the first element is allowed to be a header. Note that this could still return an empty header element, if present. | 
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 Updates the fields in the PO style header. This will create a header if add == True | 
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 Merges another header with this header. This header is assumed to be the template. 
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