The default alias for namespace 828 is "模块:" now. With reference with the other namespaces on zh.wikipedia, please modify the default alias of namespace 828 into "Module:". Moreover, it is "模組:" for traditional Chinese (zh-Hant & zh-TW & zh-HK & zh-MO) and "模块:" for simplified Chinese (zh-Hans & zh-CN & zh-SG). Please modify them accordingly. Thank you.
BTW, please also check that whether this bug existed in the MediaWiki program provided from MediaWiki.org