Spanish (es-ES) Translation Support

[spectra-aeterio]

I would like to propose adding Spanish language support to Firefly pico. I'm a native Spanish speaker and would be happy to contribute with the translation work.

Spanish is the second most spoken language by number of native speakers worldwide, and adding this localization would make Firefly pico more accessible to the Spanish-speaking community.

I'm willing to follow any existing localization guidelines or file structure you prefer for translations.

[cioraneanu]

You are more than welcomed to create a PR with the spanish translations. You get some inspiration from other languages like: 72cc1b6 😇