Tatoeba update (April 25th, 2015)

# Redirection after registration:
* Instead of being redirected to the "Help" page after registering, users are redirected to the home page. They are shown a flash message that welcomes them and recommends that they add languages to their profile.

# Lists of languages:
* The dropdown lists for adding a new language, adding a translation, or changing the language of a sentence are restricted to the languages indicated in your profile.
* People who have not added any language in their profile will not see the form to add a sentence or translation. Instead, they will see a message with a button to go to the page to add a language.
* The "Auto detect" option appears only if there are two or more languages in the profile.