Skipping the more trivial xgettext, msginit, msgcat, msgconv, msggrep, msgfilter, msgattrib, msgen, msgexec, equivalents...
msguniq, msgcomm, & msgcmp would gather dictionaries from parsed "string catalogues" to process.
We'd want a command for unioning (like msgmerge) translated strings with an updated list of strings to be translated, for which we'd need to build dictionaries followed by an intersection & both differences. Marking now-unused translations in case they're later needed.
alcinnz