Improve Spanish translations

[sergioalmela]

Improve some Spanish strings, and modify some others to make them look more human. TODO: We are using formal and informal language indiscriminately.

[sergioalmela]

Should we use formal or informal language here?

[tmoitie]

It depends, what would you normally expect to see on any given website? I'm relying on the community for these translations as I'm no multilingualist. Whichever you feel would be best, I'm happy to push forwards with either.

Thank you for contributing your time and language!

[codecov-commenter]

Codecov Report

Merging #117 (f0e7d3c) into master (1eb54da) will not change coverage. Report is 2 commits behind head on master. The diff coverage is n/a.

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[sergioalmela]

Done, as most of the webpages uses formal language

[tmoitie]

Muchas gracias