Translate string resources into Spanish

[durey]

Make sure these boxes are checked before submitting your PR - thank you!

• [X Pull request is being merged to the develop branch.
• [X] There's a reference to an Issue which this solves.
• [ ] For new features a sample has been added to the sample app illustrating this feature's behaviour.
• [X] Commits are squashed to a single commit.

[codecov-io]

Codecov Report

Merging #225 into develop will not change coverage. The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #225   +/-   ##
==========================================
  Coverage      85.41%   85.41%           
  Complexity       266      266           
==========================================
  Files             30       30           
  Lines            994      994           
  Branches          85       85           
==========================================
  Hits             849      849           
  Misses           117      117           
  Partials          28       28

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