Use localectl to see your currently active locale on Redhat 7 Linux. For example:
[root@rhel7 ~]# localectl
System Locale: LANG=en_AU.UTF-8
VC Keymap: us
X11 Layout: us
Using localectl command and its set-locale option we are able to set system locale to any locale listed by localectl list-locale command. Below we will set a system locale to en_AU.iso88591:
[root@rhel7 ~]# localectl set-locale LANG=en_AU.iso88591
[root@rhel7 ~]# localectl
System Locale: LANG=en_AU.iso88591
VC Keymap: us
X11 Layout: us
Please not the VC Keymap and X11 Layout must be set separately.