bootstrap: fix locale command

also added the locale to the testenv pre-deploy.yml,
machines spun up by test was giving locale errors in
shell.

there's a few items in the two that should
be DRYed up a little.
the variable isn't set at the `envs/default.yml` but in the bootstrap playbook itself.  I could create a variable in the envs, but it didn't seem like something we'd likely want to set other than en_US