We're planning to translate this article https://www.atlassian.com/git/tutorials/comparing-workflows to Spanish for use by our Spanish-speaking developers. When we're done, may we post the Spanish version to a page of our website (with credit to Atlassian) so that other Spanish-speaking developers can benefit from it?
Firstly, I must emphasise that I do not work for Atlassian, so it up to you if you want to act on this answer.
However, I notice that the page you linked appears to licensed under a Creative Commons Attribution 2.5 Australia License (there's a link in the footer of the page).
Under the terms of that license you are free to copy, redistribute and adapt as long as you meet the terms specified:
I would say that covers your proposed translation as long and you credit Atlassian and link to the license.
To double check, you could perhaps make a formal enquiry via Atlassian's general inquiries page.
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