Translation of the whole catalog is not what this field is for, and the model is not allowed to invent the missing pages.
Write the summary in the language you want. Keep Shopify titles in the language you already use on the store. Use the prompt to say which real links to emphasize.
What to do instead
- Summary: your language, your facts
- Prompt: emphasis and brevity
- Titles: from Shopify
- No invented translated URLs
If you need product descriptions in another language, do that in Shopify or with a description app. Then publish llms.txt from those real pages.