Add New Group Sorting Options

[Preetish-T]

I have added an option to further sort subgroups on Z-A order, and also by ascending and descending number of subgroups. Currently only the option to sort from A-Z exists.

Fixes #10249

Mandatory checks

• Change in CHANGELOG.md described in a way that is understandable for the average user (if applicable)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.
  

[ThiloteE]

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[Siedlerchr]

Please have a look a the failing tests and also https://devdocs.jabref.org/code-howtos/localization.html

[Preetish-T]

Thanks for the feedback, the test cases should be passing now.

[Siedlerchr]

codewise looks good to me

[Siedlerchr]

Sorry, but sorting by number of sub groups does not make sense. Int the issue it was about the number of entries in the group.

What you did was sorting by number of sub groups. Please implement the sorting by number of entries in the group:

[Preetish-T]

Thanks for the feedback, I realise my mistake now. I believe the latest push should properly implement the sorting by entries options.

[Siedlerchr]

Thanks, looks good to me and works!