We have now completed and tested the previously somewhat tentative upgrade support for catalog files and committed it on the oacs-50 branch. This means that going forward upgrades of the translation server will be much smoother than before. It also means that translation work done on different servers can be merged.
Note though that any conflict resolution still requires manual work by translators and that having only one canonical server to do translations on is still probably preferable.
See the comment for version 1.31.2.4 of the acs-lang.info file and the proc lang::catalog::import_messages for details.