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+# 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.
+/^msgid /{
+# 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.