The recent migration of the history routines forgot to add the new
file to the list of files from which strings should be extracted.

This fixes https://savannah.gnu.org/bugs/?52122.

The gettext-0.18.3 release was made in Jul 2013, while the 0.11.5
release was made in Aug 2002.  Time to update :).

Also drop all the bundled gettext m4 files.  When you run autogen.sh,
these will get copied in automatically for you.

So we don't have to remember its awkward target name.

And don't bother running configure and make upstairs; here is enough.

The way to update nano.pot is to run 'make nano.pot-update' in the po
subdir.  Updating a specific PO file is then done with 'make xx.po'.

(The script mistakenly included all leading comments, not just the
ones marked with "TRANSLATORS:".)

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