-bash warning: setlocale, what do I need?

Here is the warning message,

tux@linux-bodx:> su -
Password:
-bash warning: setlocale: LC_MESSAGES:cannot change locale (en_US.UTF-8): No such file or directory
-bash warning: setlocale: LC_CTYPE:cannot change locale (en_US.UTF-8): No such file or directory
-bash warning: setlocale: LC_COLLATE:cannot change locale (en_US.UTF-8): No such file or directory
-bash warning: setlocale: LC_TIME:cannot change locale (en_US.UTF-8): No such file or directory
-bash warning: setlocale: LC_NUMERIC:cannot change locale (en_US.UTF-8): No such file or directory
-bash warning: setlocale: LC_CTYPE:cannot change locale (en_US.UTF-8)

What am I missing?

Same as this one: https://forums.opensuse.org/english/get-technical-help-here/install-boot-login/481485-yet-another-utf-8-problem-2.html (Solution in post #13).
and this one: https://forums.opensuse.org/english/get-technical-help-here/applications/481527-locale-problems-might-yast.html (Solution in post #2).

Thanks hcvv.

You are welcome.