Ext4使用总结（9）radiogroup 必填项的提示信息为何是英文

Ext4使用总结（九）radiogroup 必填项的提示信息为何是英文
xtype:'radiogroup ',
allowBlank:false,
blankText:"请您选择！",

Ext.form.RadioGroup  document:

blankText : String
Error text to display if the allowBlank validation fails

Defaults to: 'You must select one item in this group'

Available since: 2.3.0

Overrides: Ext.form.CheckboxGroup.blankText