I wrote a program to directly view and edit the .archive files of UE4, because I don’t like to ex- and importing the localization content of UE4 into .po files, especially since they don’t contain the namespaces set in the Engine,
For a pre-built version you can head over to GitHub and download it from the Download section.
Aside from editing in the program, you can ex- and import CSV lists and if you have a Google Developer Account add your credentials to automatically translate texts for testing purposes.