Add translation Euskara for Admin UI

[sergixnet]

What does it do?

This code allows you to configure the admin UI in Euskara and provides translations of json file in Euskara

Why is it needed?

It is necessary for Euskara-speaking regions to be able to manage the admin in their language

How to test it?

Configure src/admin/app.js file to use Euskara language:

export default {
  config: {
    locales: ['eu'],
  },
  bootstrap() {},
};

Related issue(s)/PR(s)

None

[codecov]

Codecov Report

Base: 58.59% // Head: 58.59% // No change to project coverage 👍

Coverage data is based on head (11fb7a8) compared to base (a9e5543).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15584   +/-   ##
=======================================
  Coverage   58.59%   58.59%           
=======================================
  Files        1506     1506           
  Lines       38695    38695           
  Branches     7463     7463           
=======================================
  Hits        22675    22675           
  Misses      13698    13698           
  Partials     2322     2322           

Flag	Coverage Δ
back	47.33% <ø> (ø)
front	66.11% <ø> (ø)
unit_back	47.33% <ø> (ø)
unit_front	66.11% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...dmin/admin/src/translations/languageNativeNames.js	100.00% <ø> (ø)

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[ronronscelestes]

LGTM, thank you @sergixnet 😊