- New module I18n::Backend::Genderize keeps configuration and adds :gender option to translate().
- Module methods in Genderize allow fast checking if language needs gender and guessing gender.
- jQuery in views/users/edit.html.haml shows and hides grammatical gender select list when needed.
- Span and select list in views/users/edit.html.haml allows to choose grammatical gender.
- Key :grammatical_gender in User model keeps grammatical gender information.
- Added some methods to language_helper.rb.
- UsersController is aware of grammatical gender and is able to guess it when "getting started".

Conflicts:
	app/helpers/application_helper.rb
	app/views/comments/_comment.html.haml
	app/views/people/_person.html.haml
	app/views/shared/_stream_element.html.haml