Experimenting with more structured ways to handle command-line input/output in Rust

Add tests for `locale_select` backends on unix

Does not yet test the backends properly, only validate them against each other (and gettext-rs) on the current machine.

Created by  finchie  on June 27, 2024
JZXXFWQKOYAFQLQZDRALXG4KGEDR7JKO3AZ5Q5X7IQTS7BCJP3QAC
Change contents