po: Add dummy en_GB localization

Steps to handle translations:

 * ninja emeus-pot — updates the POT file
 * ninja emeus-update-po — updates the PO files

The installation step will handle the GMO file generation and their
installation. Translators are supposed to add PO files on their own and
update the `po/meson.build` file to include their language.

meson.build

@@ -157,8 +157,7 @@ gnome = import('gnome')
 subdir('src')
 subdir('examples')
 
-# We don't have translations, yet
-# subdir('po')
+subdir('po')
 
 if get_option('enable-gtk-doc')
   subdir('doc')

po/emeus.pot

@@ -0,0 +1,22 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the emeus package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: emeus\n"
+"Report-Msgid-Bugs-To: https://github.com/ebassi/emeus/issues/new\n"
+"POT-Creation-Date: 2016-11-30 17:29+0000\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <[email protected]>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=CHARSET\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: src/tools/emeus-edit-constraints.c:406
+msgid "Visual format parsed successfully\n"
+msgstr ""

po/en_GB.po

@@ -0,0 +1,22 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the emeus package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: emeus\n"
+"Report-Msgid-Bugs-To: https://github.com/ebassi/emeus/issues/new\n"
+"POT-Creation-Date: 2016-11-30 17:29+0000\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <[email protected]>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: src/tools/emeus-edit-constraints.c:406
+msgid "Visual format parsed successfully\n"
+msgstr ""