I am not that familiar yet with making translations like this, but if somebody could make a short mock up of what the docs should look like and how to do certain things. Then I could finish the docs by trying to translate Satchmo myself into Dutch.
The documentation should cover:
Why to use make-messages.py instead of copying another translation file.
Running the custom make-messages.py and why it is needed.
References to further documentation (django i18n docs, translation file editors).
And probably an overview or specific links about i18n usage. Ideally the docs could give enough information to create, test, and use translation files with Satchmo without reproducing much.