Use correct verbiage for username in login form.

app/views/devise/sessions/_new_ldap.html.haml

 = form_tag(omniauth_callback_path(:user, server['provider_name']), id: 'new_ldap_user', class: "show-gl-field-errors") do
   .form-group
-    = label_tag :username, "#{server['label']} Login"
+    = label_tag :username, "#{server['label']} Username"
     = text_field_tag :username, nil, {class: "form-control top", title: "This field is required.", autofocus: "autofocus", required: true }
   .form-group
     = label_tag :password