update bilingual

lib/views/admin/customize.html

@@ -222,7 +222,7 @@
           <div class="col-xs-12">
             <p class="help-block text-right">
               <i class="fa fa-fw fa-keyboard-o" aria-hidden="true"></i>
-              Ctrl+Space でコード補完
+              {{ t("customize_page.ctrl_space") }}
             </p>
           </div>
         </div>