I tried to create Greek .mo file for Buddypress using PoEdit and it seemed to ignored plural forms for the _n keyword which is used in some places e.x. _n( ‘Viewing group %1$s to %2$s (of %3$s group)’ , ‘Viewing group %1$s to %2$s (of %3$s groups)’ , $total , ‘buddypress’ )
Solution on that was simple, and found at http://stackoverflow.com/questions/12184978/poedit-doesnt-recognize-n-plurals.
Just go to the Catalog properties and at the tab “Sources keyword” add the keyword
Complete ( Current list of the keyword I use for the wordpres/buddypress translation is: