Basque language filename with bad format

Checklist

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Steps to reproduce

Filename for basque language file is bad formatted: public/lang/summernote-es-EU.js

Per ISO 639,it should be eu-ES, where eu is the code of the language and ES the regional variant.

The dict key should also be modified

Expected behavior

filename public/lang/summernote-eu-ES.js dikt key named accordingly

Current behavior

filename public/lang/summernote-es-EU.js (bad format) dikt key also bad formatted

Minimal example reproducing the issue

No response

Environment

• Summernote version: main
• Browser (with version): n/a
• OS/Platform (with version): n/a