app/views/libraries/_library_nav_links.html.haml
.col-md-12
%ul.nav.nav-tabs
%li{ class: is_active(activated_page, 'show') }
= link_to 'Library', language_library_path(library.language, library)
%li{ class: is_active(activated_page, 'edit') }
= link_to 'Edit', edit_language_library_path(library.language, library)
%li{ class: is_active(activated_page, 'history') }
= link_to 'History', '#'