Update es.yml (#281)
Update es.yml (#281)

added more idiomatic translations for Spanish

A few notes:
- I am not a native speaker, but consider myself proficient in (the latin american variety of) Spanish
- there was a bit of inconsistency regarding 2nd-person pronouns; some places were using "tú", some others "usted". It is hard to figure out which one is "correct" because that varies a lot from country to country, but I figured it is better to be consistent, and switched to "tú" pronouns and conjugation wherever applicable.
google/wikiloop-doublecheck,google/wikiloop-doublecheck,google/wikiloop-doublecheck