fixes #8263

Set LANG for terminal process and introduce setting to enable it.

* Removed all previous commit message code.
* Changed `getCommitInfo` call to return a string that is the template contents.
  * Removed from `IModel`, `IRawStatus`
* Still has issue of locating `~/some/path/with/tilde` in it.
  * path.resolve resolves to the repo's `.build` path and not the user folder.
  * I'm testing this on Windows, and I don't know the behavior on Linux.

fixes #7258

fixes #7453

fixes #7053

Fixes #6451

For the integrated terminal

Fixes #8946

Fixes #9089

fixes #8541

fixes #8856

fixes #8922
fixes #8510

fixes #9055

fixes #8948