# Sed script that inserts the file called HEADER before the header entry.
# At each occurrence of a line starting with "msgid ", we execute the following
# commands. At the first occurrence, insert the file. At the following
# occurrences, do nothing. The distinction between the first and the following
# occurrences is achieved by looking at the hold space.
# Test if the hold space is empty.
# Yes it was empty. First occurrence. Read the file.
# Output the file's contents by reading the next line. But don't lose the
# current line while doing this.
# The hold space was nonempty. Following occurrences. Do nothing.