Add & updated unit tests for localized slugs

[carstingaxion]

Description of the Change

This PR adds new tests for existing methods which prepare the localized post type & taxonomy slugs, before saving them into GatherPress' options.

It also and additionally fixes one left-over from the development of the methods. The default strings used for the slugs were new, additional strings to translate. This PR replaces the default slugs, with the already existing Post Type Singular Name and Taxonomy Singular Name labels.

Closes #

How to test the Change

Changelog Entry

Added - ... and updated unit tests for the preparation of localized post type and taxonomy slugs

Credits

Props @carstingaxion @mauteri

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[what-the-diff]

PR Summary

• Improved User Interface Consistency
  The labels for different types of posts and taxonomies on our platform have been updated to use consistent capitalization. This change will make our platform easier to use and navigate, as the format and presentation will remain constant across the system.

• Enhanced Clarity in Taxonomy Labels
  Adjustments have been made in the taxonomy label keys for improved clarity. The terms 'Taxonomy General Name' and 'Taxonomy Singular Name' are now being used, making the information easier to understand.

• Included Unit Tests for New Methods
  Additional unit tests have been added for the methods get_localized_post_type_slug and get_localized_taxonomy_slug. These tests will ensure that the newly introduced features function as expected and are capable of supporting various languages.

• Implemented Enhanced Testing Logic
  The testing logic for functions related to post types and taxonomies has been bolstered through the use of mocked translations. This enhancement enables us to verify that these functions behave correctly in the context of different language interpretations.

[carstingaxion]

Another unit-test curiosity, that isn't clear to me @mauteri :

Why does this one test fail now?

From an untouched file.
I called $user_id = $this->factory->user->create(); three times, which might be the cause.

[mauteri]

setting third argument as second argument. should be sanitize_title( $slug, '', 'save' );

[github-actions]

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