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Here is a patch for the bug described in
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1448060&group_id=5470
It follows the latest Martin followup as I understand
it. I'm not sure if multi-lines field handling should
be totally discarded while reading metadata headers (as
implemented), or if it should only be discarded for the
content-type and plural-forms header. If one think this
patch isn't correct, please comment so I can fix it.
Notice that if the second solution was intended, lines
such as 
"#-#-#-#-# fr.po #-#-#-#-#\n"
inserted by msgcat/msgmerge will have to be treated
differently (i.e. multi-lines support but skip lines
begining with a #).