We should decide in the next week if we want to do a smaller 0.5.2 release in between 0.5.1 and 0.6 (keeping the current deadline for 0.6 - March 13). The primary reason to consider that is that this important fix https://github.com/freedomofpress/securedrop/pull/2748 was not ready to go for the merge window for 0.5.1 and it’s high priority to get this out to production SecureDrops as soon as possible.
This could be a release done in the regular way, a merge of develop into master - which would necessitate the translations being ready to go with any new changes. As an alternative, for high priority backend bug fixes, I think it might make sense to do a release branched off master in order to minimize burden on translators. We would need to be disciplined about post-release cleanup (in the past a very large diff between develop and master developed that made the release process extremely slow/difficult, see https://github.com/freedomofpress/securedrop/issues/1559 for history on that) in this case.