Resolve "Languages and locale"

Rebarrequested to merge
3-download-as-default-en_us-then-install-languages-then-apply-locale into master

Closes #3 (closed) This one is tested and working for me

It clarifies locale and adds languages. Adds to documentation. Removes locale from install as as default (en_US) is always available. Applies locale later via site switch-language. core language install ... --activate will be deprecated.

Edited by Rebar

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