fix a bug about operationlist's name item converted to utf8 twice.

"Name: %1" was translated to other language.But converted to utf8 again by Utf8String::create.
zh_CN.ts is as follows:
    <message>
        <source>Name: %1</source>
        <translation>名称：%1</translation>
    </message>
but "???public.new_table" was displayed in operation list.