feat: add spanish locale

[jblancogl]

Added spanish translation.

Description

Added spanish translation.

Motivation and Context

Supporting a new language.

How Has This Been Tested?

It is not tested since it is a translation file.

Markup:

// Paste your FULL Playground.vue here

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes, dev for new features and breaking changes).
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have created a PR in the documentation with the necessary changes.

[naulacambra]

Which conflicts are blocking this PR?

[jacekkarczmarczyk]

files has been moved from /src/locale to /packages/vuetify/src/locale

[codecov]

Codecov Report

Merging #5359 into dev will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev    #5359      +/-   ##
==========================================
+ Coverage   89.72%   89.75%   +0.03%     
==========================================
  Files         267      268       +1     
  Lines        5928     5907      -21     
  Branches     1476     1464      -12     
==========================================
- Hits         5319     5302      -17     
+ Misses        488      481       -7     
- Partials      121      124       +3

Impacted Files	Coverage Δ
packages/vuetify/src/locale/es.ts	100% <100%> (ø)
packages/vuetify/src/locale/index.ts	100% <100%> (ø)	⬆️
...fy/src/components/transitions/expand-transition.js	47.82% <0%> (-2.18%)	⬇️
...s/vuetify/src/components/VDataTable/mixins/body.js	70.37% <0%> (-1.06%)	⬇️
packages/vuetify/src/components/VSelect/VSelect.js	88.26% <0%> (-0.17%)	⬇️
packages/vuetify/src/mixins/menuable.js	95.09% <0%> (-0.1%)	⬇️
.../vuetify/src/components/VDatePicker/VDatePicker.js	92.06% <0%> (-0.07%)	⬇️
.../vuetify/src/components/VTreeview/VTreeviewNode.ts	97.18% <0%> (-0.04%)	⬇️
...es/vuetify/src/components/VTextField/VTextField.js	95.9% <0%> (ø)	⬆️
...rc/components/VDatePicker/VDatePickerMonthTable.js	100% <0%> (ø)	⬆️
... and 7 more

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