#430: Use proper plurals based on image settings

[jamesmorrison]

Description of the Change

Adds singular labels where a single image is selected for generation.

Closes #430

How to test the Change

Test 1: Plural:

• Open Classifai settings:
  • set the number of images to generate between 2 - 10 (i.e. not 1)
  • Check / ensure: Enable image generation is checked
• Create a new post:
  • Open the media modal (in a new post => featured image / media block) and select Generate Images
  • Confirm the text remains as:
    • Enter a prompt below to generate images.
    • Once images are generated, choose one or more of those to import into your Media Library and then choose one image to insert.

Test 3: Singular:

• Open Classifai settings:
  • set the number of images to generate 1 (i.e. not 2 - 10)
  • Check / ensure: Enable image generation is checked
• Create a new post:
  • Open the media modal (in a new post => featured image / media block) and select Generate Images
  • Confirm the text shows singular terminology:
    • Enter a prompt below to generate an image. - new
    • Once an image is generated, you can import it into your Media Library and then select to insert. - new

Changelog Entry

Added - Add singular labels when a single image is selected for generation.

Credits

Props @jamesmorrison

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.

[jamesmorrison]

@jeffpaul / @dkotter Please could you review this change? If you'd prefer alternative singular test, please let me know what this should be updated to - I added what I thought was appropriate here.

[dkotter]

@jamesmorrison Thanks for the work here! I've left one comment that I think we should address. There's also a few other text strings that we probably want to update.

• The Generate images tab text: https://github.com/10up/classifai/blob/develop/includes/Classifai/Providers/OpenAI/DallE.php#L126
• The Generate images button text: https://github.com/10up/classifai/blob/develop/includes/Classifai/Providers/OpenAI/DallE.php#L150
• Text shown after an image is generated: https://github.com/10up/classifai/blob/develop/includes/Classifai/Providers/OpenAI/DallE.php#L154

[jamesmorrison]

@dkotter I've reverted to if else (rather than _n()) and added singular text where this was missed previously. I've tested and confirmed this works; please could you check this?