Filter refresh button is broken

[klyonrad]

this code https://github.com/sferik/rails_admin/blob/v1.0.0.rc/app/views/rails_admin/main/index.html.haml#L54

Produces broken html

when I change the line to
%button.btn.btn-primary{type: "submit", :'data-disable-with' => '<i class="icon-white icon-refresh"></i>'.html_safe + t("admin.misc.refresh")}

edit: deleted snarky comment

[mshibuya]

Fixed by #2706.