Add a link for Ho Ngoc Duc, a=chris

diff --git a/en-US/pages/about.thtml b/en-US/pages/about.thtml
index 707b4c8..6aa0b51 100755
--- a/en-US/pages/about.thtml
+++ b/en-US/pages/about.thtml
@@ -43,7 +43,8 @@ locale/locale-tag/resources folder of the Yioop! project. These
 are also licensed using the same license. For Vietnamese,
 I used the following <a
 href="http://www.informatik.uni-leipzig.de/~duc/software/misc/wordlist.html">
-Vietnamese Word List</a> obtained with permision from Ho Ngoc Duc.
+Vietnamese Word List</a> obtained with permision from <a
+href="http://www.informatik.uni-leipzig.de/~duc/">Ho Ngoc Duc</a>.
 </p>

 <h1>Additional Credits</h1>