Vygotsky is one of the eminent persons, marking the whole scientific directions. However, the western scientists have to use quite a controversial translation into English. The problem is evident on this picture:
Photo retrieved here: https://twitter.com/ilyenkov_et_al/status/703249167020396546
As a result, this leads to quite exotic concepts in which Vygotsky looks like Bakhtin.
More comments in Russian http://rubtcova.com/2016/02/27/проблема-перевода-работ-выготского-н/
Futher reading in English: