Ensure locales are installed. Set correct format.

Ensure locales are installed. Set correct format.

I guess Ubuntu just tolerated the incorrect spelling.  Or used to?  Anyway..

```
root@toko07:~# grep PRETTY_NAME /etc/os-release
PRETTY_NAME="Ubuntu 24.04.3 LTS"
root@toko07:~# locale -a | grep -i en_us
en_US.utf8

[root@toko08 ~]# grep PRETTY_NAME /etc/os-release
PRETTY_NAME="CentOS Stream 9"
[root@toko08 ~]# locale -a | grep -i en_us
en_US
en_US.iso885915
en_US.utf8
```

Signed-off-by: David Galloway <david.galloway@ibm.com>