Yahoo! login

Can anyone explain what happened? I was seated in the pharmacy of the Bukit Mertajam gpvernment hospital, patiently waiting to collect my medication and trying to access my Yahoo! email account on my mobile phone. I felt a bit perplexed when the login screen flashed up and displayed instructions in Vietnamese. Now, you know and I know that Bukit Mertajam is certainly not in Vietnam. So why did this happen? Why a Vietnamese login screen?