Change locale in the RHEL system?

Use localectl tool or edit /etc/locale.conf

1. Change locale.conf
# cat /etc/locale.conf
LANG=pt_BR.utf8
LANGUAGE=
LC_CTYPE="pt_BR.utf8"
LC_NUMERIC="pt_BR.utf8"
LC_TIME="pt_BR.utf8"
LC_COLLATE=C
LC_MONETARY="pt_BR.utf8"
LC_MESSAGES="pt_BR.utf8"
LC_PAPER="pt_BR.utf8"
LC_NAME="pt_BR.utf8"
LC_ADDRESS="pt_BR.utf8"
LC_TELEPHONE="pt_BR.utf8"
LC_MEASUREMENT="pt_BR.utf8"
LC_IDENTIFICATION="pt_BR.utf8"
LC_ALL=

2. Reboot the system
# reboot

What happens if some apps doesn't show the new language? Probably the apps doesn't support different languages (locales).

Reference: https://www.osetc.com/en/centos-7-rhel-7-change-the-system-locale.html