Content Resizing: The "shorten" action does not detect the character length of Japanese text

[t-hamano]

Description

Similar to #571

The "shorten" action requires that a paragraph contain more than 5 words. However, CJK languages like Japanese and Chinese do not use spaces between words. Consequently, this feature cannot be utilized even with sufficient content.

We should adopt a locale-aware approach rather than hard-coding the words. So, as the word count type, we should use the translated text.

https://github.com/WordPress/gutenberg/blob/1ecc3d2fe9c819af35ef312563805bc16a103036/packages/block-library/src/post-time-to-read/edit.js#L51-L61

ai/src/experiments/content-classification/components/SuggestionPanel.tsx

Line 77 in 396fcc3

'Add more content to enable AI suggestions (approximately 150 words).',

Step-by-step reproduction instructions

1. Change the site language to Japanese.
2. Open a post.
3. Copy the following text and paste it multiple times inside a paragraph block: あああああああああああ
4. Execute the Shorten action
5. Confirm that an error notice is displayed.

Screenshots, screen recording, code snippet

Recording.2026-05-19.182908.mp4

Environment info

No response

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except the AI plugin.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure