I was bored this Monday night and installed the latest dev version of OA (via github, drush_make, etc, you know me), in every single language, via Aegir.
Three locales threw errors on install: Catalan, Italian, and French. All with the same error:
The translation file $locale.po contains an error: the plural formula could not be parsed.
Where $locale = ca, it or fr
All other locales work fine on install.