The beta versions include new features and protocol enhancements that are not currently in the release version.
Both Basic and Pro versions have their 2.5.x Beta version (the current release is 2.4.4).

About the 2.5.x beta versions:
The German translation was produced by a native German speaker. But there may still be some quirks in the beta translation. The French translation is tested since several months.
There will be also a Spanish translation from a native Spanish speaker. And may be a Dutch version if some Dutch translator helps us to revise the current translation.
Support for other non European languages is in progress.
Translations can be added and tested on 2.4.x versions of LimeWire, by extracting files from the 2.5.x message bundles in the LimeWire lib subdirectory, and editing your limewire.props file to set an alternate language such as "fr", "de", "es", "nl".
Portuguese (po) and Italian (it) translators are welcome to contribute a translated MessagesBundle from either the English or French messages which both are up to date !
Submit your translations by writing to this forum.