Fix incorrect translation.

app/views/users/admin_login.html.erb

@@ -9,7 +9,7 @@
         <%=form_tag({}, method: :put) do %>
             <%= label_tag(:second_factor_token, t('login.second_factor_description')) %>
             <%= text_field_tag(:second_factor_token, nil, autofocus: true) %><br><br>
-            <%= submit_tag t('login.submit')%>
+            <%= submit_tag t('submit')%>
         <% end %>
       <% end %>
     <% else %>