Thread:Translating talk:OpenStreetMap/Potlatch 2/reply (11)

I don't have Flash either, but the .properties files are plain text, similar to the formats of some other projects already supported here.

If you're talking about making changes to the software itself (to further internationalize it, for instance), the OpenStreetMap Wiki has a guide to getting started. It requires the Flex SDK, which is open source and cross-platform. Hope that helps.