[fix][i18n] Enable Spanish

[serenajiang]

CATEGORY

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

Spanish was added a year ago but was never actually enabled.

TEST PLAN

tested locally

REVIEWERS

@etr2460

[codecov-io]

Codecov Report

Merging #9010 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #9010      +/-   ##
==========================================
- Coverage   59.16%   59.15%   -0.02%     
==========================================
  Files         367      367              
  Lines       11679    11682       +3     
  Branches     2862     2864       +2     
==========================================
  Hits         6910     6910              
- Misses       4590     4593       +3     
  Partials      179      179

Impacted Files	Coverage Δ
.../assets/src/SqlLab/components/AceEditorWrapper.jsx	54.32% <0%> (-1.38%)	⬇️
...uperset/assets/src/SqlLab/components/ResultSet.jsx	77.55% <0%> (-0.8%)	⬇️
superset/assets/src/chart/chartAction.js	47.94% <0%> (ø)	⬆️

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[etr2460]

lgtm, thanks!