I think the list of most important languages is not important. Given the
difficulty we've had even getting people to translate those few strings
for book names and the UIs and the fact that we can't make anyone do
translations like a company could, we should just accept whatever help
comes forward and not worry about the rest.
Agree. And you may got some amazing result. For example, in Mozilla we run the localization project. And we got many languages we didn't expected .
See http://www.mozilla.org/projects/l10n/mlp_status.html for details.