Moment.js's locale will be set automatically now if Moment.js is loaded on the client

The caveat is that currently Moment.js package from Atmosphere does not load the languages (https://github.com/acreeger/meteor-moment/issues/4).
In this case, language change silently fails without any trouble. It is easy to manually add specific language file to the project for now, then mf will change to that language successfully.