methods modifying structure are replaced with methods that compute arrays that could later on be merged separately

address, city, country, data_born, default_written_communication_language, email, first_name, languages, last_name, phone_number, phone_number_2, phone_number_3, postal_code removed from study_subject (all this information is stored in subject)

the code is fixed so unit test passes

locale names on Windows OS are different than Linux/MAC OS, therefore
new field is introduced for windows locale name in a language definition