add routing support for english and spanish
add sample language files for spanish and english, lessons controller now loads this language content
create a route to set locale in user's session
add migration for translation table and locales table
add eloquent models for locale and translation - setup eloquent relationships
remove flat file translation in favor of database based translation
Lessons now have related translations which belong to locales - we can calculate the translation in the view and decide which translation of a lesson to show - if no translation is necessary, translations are not queried