Monolingual is a program for removing unnecesary language resources from Mac OS X, in order to reclaim several hundred megabytes of disk space.

I don't know about you, but I use my computer in only one (human) language — English. And I'm willing to bet that you do too, albeit perhaps not English. So why do you have a bunch of localization files for the Mac OS X operating system filling up your hard drive? Enter Monolingual — a handy utility for reclaiming your space for more useful things… like international mp3 files, email or whatever you like.

Requirements:
OS X 10.13+
64-bit Intel

Also available are:
Version 1.7.8 for OS X 10.12
Version 1.7.3 for OS X 10.11
Version 1.6.7 for OS X 10.10
Version 1.5.10 for OS X 10.7-10.9