Added Spanish translation files

[MrLuigi002]

Things that aren't translated:

• Character, guitar and store descriptions: As far as I know they aren't accesible in this version.
• Song sections: For consistency when discussing with the community.
• Tutorials and Career: Also not accesible.
• Venue names: They weren't translated in the OG game.
• Memory Card messages: Not in use in this version.
• Some hardcoded strings: The Practice pause menu and Deluxe Settings as examples.

Everything else is translated to Spanish, including some things that don't show in this version (I started working before playing the game lol).

_localexbox.dta has partial translation due to some of it's strings being used and others not.