l10n: vi.po & TEAMS: review Vietnamese translation

* Add Duy into Vietnamese team
* review translation

Signed-off-by: Tran Ngoc Quan <vnwildman@gmail.com>

po/TEAMS

@@ -33,8 +33,9 @@ Repository:	https://github.com/nafmo/git-l10n-sv/
 Leader:		Peter Krefting <peter@softwolves.pp.se>
 
 Language:	vi (Vietnamese)
-Repository:	https://github.com/vnwildman/git.git
+Repository:	https://github.com/vnwildman/git/
 Leader:		Trần Ngọc Quân <vnwildman AT gmail.com>
+Members:	Nguyễn Thái Ngọc Duy <pclouds AT gmail.com>
 
 Language:	zh_CN (Simplified Chinese)
 Repository:	https://github.com/gotgit/git-po-zh_CN/