gettext for UI translation

[John Anderson <janderson@soltra.com>]

I realize that our main translation use case is concerned with Content Translation, and not User Interface Translation. However, there is a widely-established toolchain for UI translation, namely gettext[1]. If we ever think about standardizing any non-Content-Translation, gettext is the way to go.

[1] https://www.gnu.org/software/gettext/

JSA