Translating WordPress into Vietnamese is really easy.

First, make sure you sign up for a WordPress.org username. Then, go to /trunk/ on GlotPress and view the strings that do not have a translation:

Screenshot 2013-12-13 19.33.24

Next, double-click on a row that needs a translation and add your translation:

Screenshot-2013-12-13-19.28.06

That’s it!