anchor.diff:      <div class="form-group">
         <label for="access_key" class="col-sm-3 control-label"><%= t 'app_settings.access_key' %></label>
         <div class="col-sm-7">
  -        <input type="text" class="form-control" id="access_key" name="access_key">
  +        <input type="text" class="form-control" id="access_key" name="access_key" pattern="[^\s]+" required>
           <p class="help-block"><%= t('app_settings.msg.access_key') %></p>
         </div>
       </div>
  
positive.code:     <div class="form-group">
        <label for="secret_access_key" class="col-sm-3 control-label"><%= t 'app_settings.secret_access_key' %></label>
        <div class="col-sm-7">
          <input type="text" class="form-control form-control-masked" id="secret_access_key" name="secret_access_key">
          <p class="help-block"><%= t('app_settings.msg.secret_access_key') %></p>
        </div>
      </div>
  
negative.code:       <label class="col-sm-3 control-label"><%= t 'app_settings.aws_keypair' %></label>
        <div class="col-sm-7">
          <label for="keypair_name" class="control-label"><%= t 'app_settings.keypair_name' %></label>
          <input id="keypair_name" class="form-control ec2-private-key-name" type="text" name="keypair_name" required maxlength="255">
  
          <label for="keypair_value" class="control-label"><%= t 'app_settings.private_key' %></label>
          <textarea id="keypair_value" class="form-control ec2-private-key-value" name="keypair_value" placeholder="<%= t 'common.msg.key_droppable' %>" rows="7"></textarea>
  