I am wondering what the advantages would be to put in all the effort to create new language pack while one could use a widget from one of the big developers which translates not only the interface, but also the content.
Would it not make more sense to have one of the gurus create a (free) plugin for these?
The Google one is more configurable but when pasting the widget code into admin > settings > page > Custom head code, the browser falls over
BING
The Bing one's widget code has a <div> tag which suggests that one paste the <script> portion into admin > settings > page > Custom head code and the <div> into admin > settings > page > Custom tail code, but this doesn't work.
I did not check others, but it seems much less effort to develop in the direction of incorporating existing free widgets rather than trying to re-invent the wheel every time a new language is needed (and even then this is only a partial translation, content stays....)