When logged in as the administrator, click
Admin on the top navbar.
On the left column, click Settings then Board Settings.
Under the Culture, that should be set to Vietnamese.
Also under Settings, click Languages, and edit Vietnamese default, register, etc., so perhaps it's more accurate.
Lastly, try viewing the registration e-mail in another e-mail client. Some e-mail clients are strange and change the language. If you're using browser e-mail the e-mail might show up in the language you have your browser set to, but then you say you don't understand the language.
And remember, at present you set the default language and the users can register ONLY in that language and change their language preference after registration.
Finally, something that will work for sure .... figure out what language it's being sent in. Just open up Google Translator , copy the email and paste it in the left box, and let it detect the language itself. So my last (and most important) suggestion is to open up languages ----> English.xml or languages---> vietnamese.xml or whatever language google says the email is. Open up that .xml file. So if it's being sent in Hungarian, open up languages ----> hungarian.xml.
But for instance, English.xml, find this:
You have requested to join the {forumname}, but before you can join your email address must be verified.
To verify your email address open the following link in your web browser:
{link}
Your approval key is:
{key}
Visit the {forumname} at {forumlink}
Bạn có thể đặt một tin nhắn cá nhân ở đây bằng tiếng Việt và nói bất cứ điều gì bạn muốn.
You can add a personalized message here to tell the user what you want said
And the other words that are in there, like, "You have requested to join the" .... just change it to Vietnamese. Change all the words you want changed to Vietnamese. Save that particular .xml file and upload it and replace the old .xml file. At least that's what I'd do.
Jason Weber
USS Vision YAF
"Money is better than poverty, if only for financial reasons"