Merge branch 'minor-fix-in-new-ldap-view' into 'master'

Fix Login -> Username in LDAP sign-in form

Little mistake I did when merging CE->EE, `Login` should be `Username` (see the CE MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6947/diffs#c2bdcb101cb41d9cda1c4d451e9323a0dc694be2_4_3)

See merge request !806

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