In case it helps, not as a final solution but to understand how to track the issue, in my case I installed ES_MX language, also tried ES_CL, ES_ES, ES_CO but none of them are working, so I just check in setup->System Diagnostics-> it shows locale is not installed
Language configuration consistency Required ES_CL
ES_MX
es_CL
es_CO
es_ES
es_MX
Missing system locale: ES_CL.UTF-8
Missing system locale: ES_MX.UTF-8
so I tried in an SSH session in my server/host provider and verified the locale installation by using:
locale -a|grep -i mx
I got all this values:
es_MX.iso88591
es_MX.utf8
nhn_MX
nhn_MX.utf8
Then tried to set the local to es_MX.utf8 by using:
sudo update-locale LANG=es_MX.utf8 LANGUAGE
but as I have a shared environment in hostgator I was not able to set the value yet. I got the error
sudo update-locale LANG=es_MX.utf-8 LANGUAGE
sudo: effective uid is not 0, is /usr/bin/sudo on a file system with the 'nosuid' option set or an NFS file system without root privileges
I have raised a support ticket to Hostgator, hope they can set the locale for me otherwise I will have to live without using ES_MX language. let you know in case I got a solution from them. thanks and hope this help somebody else.