16. Enabling multilanguage content

This enables multilanguage content and some translations.

* Add the _locale in the routing definition for static routes
* Have the SimpleCms page documents add the locale pattern
* Add some translations
* Enable LuneticsLocaleBundle and use locale choosers
* Add translation file for messages.

Note: For this branch, in addition to reload the fixtures, you need to clear the cache to make symfony pick up the german translation file. Btw, i did not add any french here, but the process would be exactly the same as for german.