Updates spectrum.zsh
suggest setting $LANG to fix #1286 and fix #1823
mention $ZSH_CUSTOM as suggested in #2295
$ZSH is the OMZ installation folder, not configuration
Merge pull request #2645 from ncanceill/template-zshrc

Improve template zshrc
Merge pull request #2390 from LFDM/updating_spectrum

Updates and refactors spectrum.zsh
Merge pull request #2563 from bobwilliams/master

Adds command line aliases useful for dealing with JSON