This can be generated via xgettext(1) regularly,

If this file is generated regularly, it becomes easier for translators to keep up with changes to the source code.  (Or, at least changes with accompanying gettext calls).

This was generated with:

  # for i in `git grep --name-only 'gettext' | grep -v 'pot$'` ; do
  #  xgettext -j -o ./src/share/locale/en/LC_MESSAGES/OPNsense.pot "${i}"
  # done
Signed-off-by: Isaac (.ike) Levy <ike@blackskyresearch.net>

src/share/locale/en/LC_MESSAGES/OPNsense.pot

-# OPNsense gettext canonical base.
-# Copyright (C) OPNsense project.
-# This file is distributed under the same BSD license as the OPNsense project.
-# Isaac (.ike) Levy <ike@blackskyresearch.net>, 2015.
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
 #
+#, fuzzy
 msgid ""
 msgstr ""
-"Project-Id-Version: >15.1.9.2\n"
+"Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2014-03-15 18:00-0400\n"
-"PO-Revision-Date: 2015-05-10 00:00-0400\n"
-"Last-Translator: Isaac (.ike) Levy <ike@blackskyresearch.net>\n"
-"Language-Team: ENGLISH <http://opnsense.org/>\n"
-"Language: EN\n"
+"POT-Creation-Date: 2015-05-11 00:25-0400\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: \n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=ISO-8859-1\n"
+"Content-Type: text/plain; charset=CHARSET\n"
 "Content-Transfer-Encoding: 8bit\n"
 
 #: src/etc/inc/auth.inc:108