Extract images from message templates [duplicate]

I am supporting a Gmail user who has saved 50 message templates, the maximum allowed.

I want to extract all the images from the templates, and save them to a directory attachments on my PC.

My current approach:

1. In Gmail, compose a new message;
2. Insert a template;
3. Use the browser's Save as > Webpage, Complete option to save the page locally;
4. Identify the relevant unnamed(n).png images from the newly saved files;
5. Add those identified images to my attachments directory;
6. Repeat steps 2 - 5 for each remaining template.

Is there a 'bulk' way of doing this? Ideally, I would like to find Gmail's templates directory.