Internationalization & Localization ?

As kilishan wrote: "it adds to the complexity of the system". Gettext is not beginners friendly also. It is much easier to change strings in PHP files, than to change them in PO files.

On the other side, if you are familiar with gettext and if you have appropriate editor, than it is very easy to make a translation even for non programmers. But this is more advanced level and I prefer simplicity instead of complexity. :-)