Reserve Spanish translation

- Native language: Spanish
- Part of bounty you apply for (ANN/WP): ANN/ WP,...
- Translation/moderation experience (if any): https://bitcointalk.org/index.php?topic=2770785.msg28315744#msg28315744
- Bitcointalk username: psousal
- ERC-20 wallet address: 0xcEC4178d158142997C3FaD2856d6CFC6d195f570