When package is emerged, it dumps LC_MESSAGES for many languages, whereas I have the line 'LINGUAS="en"' in make.conf.
LC_MESSAGES contains unwanted files
LC_MESSAGES should contain only files for selected LINGUAS
I won't add USE flags for controlling the installation of one file per USE, also, as explained in:
that doesn't seem the way to go (probably install_mask would be the best)