Rename Catalan filename for correct locale naming

[pereorga]

"ca-ES" stands for Catalan as spoken in Spain. "CA" in "ca-CA" is the ISO country code for Canada.

[bogdan-the-great]

Is this the same situation as in #604?

[xeanhort]

Yes it is. I'm not sure about the issues mentioned there (loosing the configuration in the devices) or if the best option is to duplicate them.

In fact, I think the best option is to remove the country codes whenever possible and keep only the first part.

[pereorga]

@piotr-marendowski @xeanhort let me know if you want me to rebase this, or if you want me to switch to use ca.json.

[xeanhort]

PR with the latest changes here. Once merged, @pereorga, you can proceed with the best approach to fix this

[pereorga]

@xeanhort thanks. I don't think it makes sense to keep rebasing this PR. Instead, I've created #696 to track the issue.