Free software "Monolingual" to delete unnecessary language resources of Mac OS X
Unusual free software that removes unused language resources from Mac OS X to ensure free space. It is open source.
Download from below.
Download it here.
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Approximately, it seems that it is possible to secure free space of about 800 MB to several GB. As a precaution, Japanese version resources and English version resources should not be deleted.
The actual usage seems to be detailed on the following site.
Monolingual 1.3.4: PISCES
in Software, Posted by darkhorse_log