Starting from this morning, the namespaces (ie. URIs) have changed from the canonical names (User, User talk, Wikipedia talk, Template etc.) to the partially localised versions (用戶, 用戶傾偈, Wikipedia 傾偈, 模 etc.) for no obvious reason (MediaWiki update?). The software now inconsistently displays the canonical namespace names sometimes and the localised namespace names at other times.
The critical problem is that one canonical namespace name, "Wikipedia talk:", stopped working altogether. This created thousands of broken links overnight. We admins at zh-yue.wp are desperate to know what happened and request this issue to be fixed as soon as possible.