PDF Translation Function Merges Pages in the Wrong Order

[mschmermer]

Description:

When using the translation feature with a PDF file, the following issue occurs:
The pages of the PDF are correctly split into images and processed. However, the images are merged back together in the wrong order, resulting in the translated output not matching the original PDF. This makes the function completely unusable, as the translations (e.g., via GPT) are meaningless to the user.

Steps to Reproduce:
1. Upload a multi-page PDF file.
2. Start the translation process for the PDF.
3. Check the generated translations and the order of the pages.

Expected Behavior:
The pages should be merged back in the same order as in the original PDF, ensuring the translations are coherent and usable.

Actual Behavior:
The pages are merged in the wrong order, making the content incorrectly translated and unusable.

Possible Causes:
• Errors when sorting images after processing.
• Possibly incorrect naming of temporary image files.

Examples:
black-clover-Chapter348_translated.pdf

black-clover-Chapter348.pdf