Usually, when installing a package to be built from source, I use options on ./configure to set local destinations, especially as I am usually not doing it as root for all users, bu for my private use in my private space.

However, localization usually means LOCALE and local language support, which is a big deal encompassing many files and ENV var., but there is a lot of localization support in open source. Start with locale:

Code:

$ locale
LANG=C
LC_CTYPE="C"
LC_COLLATE="C"
LC_MONETARY="C"
LC_NUMERIC="C"
LC_TIME="C"
LC_MESSAGES="C"
LC_ALL=C
$

https://www.unix.com/man-page/opensolaris/1/locale/