[Rd] Translations and snprintf on Windows

[Michael Chirico]

[a bit unsure on if this is maybe better for r-package-devel]

We recently added translations to messages at the R and C level to
data.table.

At the C level, we did _() wrapping for char arrays supplied to the
following functions: error, warning, Rprintf, Error, and snprintf.

This seemed OK but the use of snprintf specifically appears to have caused
a crash on Windows:

https://github.com/Rdatatable/data.table/issues/4402

Is there any guidance against using gettext with snprintf, or perhaps
guidance on which "outputters" *are* OK for translation?

Michael Chirico

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