Short form of days added for delivery time module

[aihimel]

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• My code follow the WordPress' coding standards
• My code satisfies feature requirements
• My code is tested
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Changes proposed in this Pull Request:

Closes

• Closes https://github.com/weDevsOfficial/dokan-pro/issues/2659

How to test the changes in this Pull Request:

• Check https://github.com/weDevsOfficial/dokan-pro/issues/2659

Changelog entry

Short from of weekdays added at dokan_get_translated_days function.

PR Self Review Checklist:

• Code is not following code style guidelines
• Bad naming: make sure you would understand your code if you read it a few months from now.
• KISS: Keep it simple, Sweetie (not stupid!).
• DRY: Don't Repeat Yourself.
• Code that is not readable: too many nested 'if's are a bad sign.
• Performance issues
• Complicated constructions that need refactoring or comments: code should almost always be self-explanatory.
• Grammar errors.

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