Monolingual is a program for removing unnecessary language resources from macOS, in order to reclaim several hundred megabytes of disk space. It requires a 64-bit capable Intel-based Mac and at least macOS 10.13 (High Sierra). If you use your computer in only one (human) language, you may not need to be taking up space on your hard drive with extraneous localization files. Monolingual will locate and eliminate these space-wasting files.
Download: Monolingual 1.8.2