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Check out the guide below, you need to find the right locale for spanish in /etc/locale.gen remove the # before the line that you need and then run sudo locale-gen There are more options them I em used to, you probably just need one line un-commented.
The "uncomment line in /etc/locale.gen worked. Thanks @Hanzel and @Nachlese!
But this is still weird for me… I have a second PC with Manjaro (laptop), also with “Spanish (Peru)” language set. I didn’t update system yet, and I checked /etc/locale.gen file and all lines in file are commented. So, why is my Spanish language configuration working fine in my laptop (non-upgraded) but lost in my mail PC (just upgraded)?
It probably has been replaced/overwritten - well, not probably, but rather: obviously
… which shouldn’t have happened.
As soon as the package “glibc” is updated, the command “locale-gen” is run.
If the file is pristine - like new, with everything commented - you’ll lose your locale setting in that moment.
… check that file in your other computer and uncomment what you need so the next update of glibc will not harm you
perhaps make a backup of that file sudo cp /etc/locale.gen /etc/locale.gen.original
Why this happened? I don’t know.
But it hit many - the forum is full of it.