[Other] i18n: catalan language translation. Adding ca-ES translated file (attached) to source code

[xavierb1777]

Hi,

I'm new here. I translated the interface of krux to catalan. I attach the file. I do not know how make a pull request. Anyway, it's trivial to include such file in your repository.

Thanks in advance,

ca-ES.json

[xavierb1777]

Finally I made my first pull request