As you can see, if you not translate backup.po, new_backup file is equal to original backup file, BUT with one difference, backup.new file has added a line at the header: Do we have to remove this line. ?
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As you can see, if you not translate backup.po, new_backup file is equal to original backup file, BUT with one difference, backup.new file has added a line at the header: We remove this line with newxml