On the translation server export page it says:

"It is not advised to use big .po files for importing in Drupal though, as it might lead to incomplete imports. Use packages for usage with Drupal importing."

I wonder what is considered big. The ubercart-5.x-1.0-rc4-pt.po export file is 350 Kb. Is this big and why i'm getting incomplete imports?

And what about the autolocale module. How does it work? Care to explain ?