re #84 add method to get language object by language label
re #84 update internationalization script to be able to manage available
languages for the seller
re #84 update form elements names, ids and classes in the
internationalization template
re #84 separate the action to update seller languages parameters inside
a separated function
re #84 update languages services unit tests for the new method
get_language_by_label
re #84 fix error in unit test of Language services
re #84 delete useless models declarations and simplified code of
__init__ method
re #84 rename the dictionary variable languages to available_languages
Merge pull request #106 from jean553/fix_84

Fix 84 - Integrate database save process of seller languages options