Spanish translation (WIP)

[ArenaL5]

While correcting some (very) minor mistakes and omissions in your current Spanish translation, I noticed you were tweaking the interface. So I decided to update all the messages and manual to match your current English ones.

For the moment, I'm tagging this as a draft PR both because I'm not sure you're finished, and because my translation might need a review.

(Particularly, I don't know exact Spanish one-word matches for the verbs “whitelist” and “secure”, so I used “allow” and “protect” almost everywhere for convenience).

[codecov-commenter]

Codecov Report

Merging #161 (a2281a8) into master (68a45b6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #161   +/-   ##
=======================================
  Coverage   99.22%   99.22%           
=======================================
  Files          10       10           
  Lines         644      644           
=======================================
  Hits          639      639           
  Misses          5        5           

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[ArenaL5]

Double-checked the translation and unset the Draft status, for visibility.