rewrite (userconfig): Add user config cog.

src/modules/user_config/__init__.py

@@ -0,0 +1,11 @@
+import logging
+from babel.translator import LocalBabel
+
+logger = logging.getLogger(__name__)
+babel = LocalBabel('user_config')
+
+
+async def setup(bot):
+    from .cog import UserConfigCog
+
+    await bot.add_cog(UserConfigCog(bot))