update bilingual

lib/views/admin/users.html

@@ -136,7 +136,7 @@
         </div><!-- /.modal-dialog -->
       </div>
 
-      <h2>ユーザー一覧</h2>
+      <h2>{{ t("user_management.user_list") }}</h2>
 
       <table class="table table-hover table-striped table-bordered table-user-list">
         <thead>