fixed a bug where a missing episode thumbnail would be rendered too
large in the recently added episodes list
fix link to readme in the backend form (thanks @Galixte)

Closes #110
added support for dropdown list settings
make it possible to omit hashing the password when a User model is saved
add a findCurrent() helper to the User model
fix file ending
make the setting definitions non-static so we can use Yii::t() on them
add Yii::t() tags to all lose strings
add yiic message configuration file and messages directory
invalidate the main menu cache when language changes
add ability to change session language from the menu
add initial French translation
add a setting for defining the global application language and use it
when a user hasn't specified a language himself.

This way the login screen will also be translated.
show a notification to administrators that changing their own language
won't affect other users
add a language column to the user table
implement the "set as default" checkbox when a user changes language
show a notification if the user's language settings overrides the
application language when saving settings (to not confuse the user
when the language is not being changed)