Add missing string to .pot file

languages/cmb2.pot

@@ -2,13 +2,13 @@
 # This file is distributed under the same license as the CMB2 package.
 msgid ""
 msgstr ""
-"Project-Id-Version: CMB2 2.1.2\n"
+"Project-Id-Version: CMB2 2.2.0\n"
 "Report-Msgid-Bugs-To: http://wordpress.org/support/plugin/cmb2\n"
-"POT-Creation-Date: 2016-02-28 03:45:29+00:00\n"
+"POT-Creation-Date: 2016-02-28 04:30:43+00:00\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"PO-Revision-Date: 2016-2-27 3:45+300\n"
+"PO-Revision-Date: 2016-2-27 4:30+300\n"
 "Last-Translator: WebDevStudios [email protected]\n"
 "Language-Team: WebDevStudios [email protected]\n"
 "X-Generator: grunt-wp-i18n 0.4.9\n"
@@ -251,7 +251,7 @@ msgstr ""
 msgid "Image Caption"
 msgstr ""
 
-#: example-functions.php:467 example-functions.php:537
+#: example-functions.php:467
 msgid "User Profile Metabox"
 msgstr ""
 
@@ -283,6 +283,10 @@ msgstr ""
 msgid "User Field"
 msgstr ""
 
+#: example-functions.php:537
+msgid "Category Metabox"
+msgstr ""
+
 #: example-functions.php:552
 msgid "Term Image"
 msgstr ""