Steps to reproduce

Run asdf. In help output a line is printed for the asdf env command:

asdf env <command> [executable]      Prints or runs an executable under a command environment

I would assume <command> is an arbitrary command. But from what I can tell needs to be a plugin name or a shim name? I'm also not sure how this differs from executing the shim directly.

FY

Is your feature request related to a problem? Please describe.

Currently yvm only supports english and has no easy way to convert the messaging to other languages

Describe the solution you'd like

Abstract all cli messaging and support translating into other languages

**Describe alternatives you've consider

It looks like RVM is no longer updating their binaries for newer OS versions:

chruby-fish ❯ make test

./test/setup
>>> Downloading https://rvm.io/binaries/osx/10.13/x86_64/ruby-2.2.5.tar.bz2 ...
--2018-09-15 10:23:47--  https://rvm.io/binaries/osx/10.13/x86_64/ruby-2.2.5.tar.bz2
Resolving rvm.io (rvm.io)... 151.101.130.49, 151.101.194.49, 151.101.2.49, ...
Connecting to rvm.io