app/views/labs/_header.html.haml
.view-as
.btn-group
= link_to labs_path, class: "list btn #{action_name == 'index' ? 'btn-primary' : 'btn-default'}" do
= t("shared.list_view", default: "List view")
= link_to map_labs_path, class: "map btn #{action_name == 'map' ? 'btn-primary' : 'btn-default'}" do
= t("shared.map_view", default: "Map view")