SirVer has been diligently working on merging our 4 worlds (Blackland, Desert, Greenland, and Winterland) into one world, so there will be more flexibility when creating maps. We will merge the existing translation into the new
one_world po file, so most of your translations will be saved.
However, a few strings will go "fuzzy" because of small (but necessary) changes, and Launchpad will kick these out. So, I recommend that you grab an offline copy of the 4 world files, so you can then use your translaion memories to speed up the translation for the strings that have slight changes to them.
I'm also grabbing an archive, so if you did not see this in time, you can ask me for the files.