Added i18n support using Babel and Spanish translation

setup.py

@@ -4,6 +4,7 @@
 .. _github: https://www.github.com/snide/sphinx_rtd_theme
 
 """
+from babel.messages import frontend as babel
 from setuptools import setup
 from sphinx_rtd_theme import __version__
 
@@ -43,4 +44,13 @@ setup(
         'Topic :: Documentation',
         'Topic :: Software Development :: Documentation',
     ],
+    install_requires= [
+        'Sphinx>=1.4.1',
+    ],
+    cmdclass = {
+        'compile_catalog': babel.compile_catalog,
+        'extract_messages': babel.extract_messages,
+        'init_catalog': babel.init_catalog,
+        'update_catalog': babel.update_catalog
+    },
 )