A translation of E842 by Ernest Hirsch is available here.
The Euler Archive attempts to monitor current scholarship for articles and books that may be of interest to Euler Scholars. Selected references we have found that discuss or cite E842 include:
Maltese G., �On the relativity of motion in Leonhard Euler's science.� Archive for History of Exact Sciences, 54 (4), pp. 319-348 (2000).