We do not know French language. Nor do we know language translation techniques. We may infer Mitchell's efforts were all manual and labors of love. Today, by comparison, we would use automated language processors to assist. We sense, however, that many of Bergson's semantics lost some of their Bergsonian French glow in translation.
Simple examples are classicists' over-zealous use of thelogos .
We sense Mitchell did this in spades, and probably altered at least some of Bergson's semantic intent. In English a 'this' or a 'that' could very easily be 'the,' and indeed and unfortunately often is . We assume Mitchell substituted 'the' for each. Where French is subtle and full of nuance, English is somewhat brutish and lacking finer sensibilities. That lingual deficit discounts English speakers' abilities to grasp essential discernments of quantum philosophy and science from classical philosophy and science.