accepted_talks_abstracts: correct json entry name
accepted_talks_abstracts: correct json entry name

EuroPython/epcon,matrixise/epcon,malemburg/epcon,malemburg/epcon,malemburg/epcon,barrachri/epcon,PythonSanSebastian/epcon,artcz/epcon,artcz/epcon,EuroPython/epcon,barrachri/epcon,barrachri/epcon,malemburg/epcon,barrachri/epcon,PythonSanSebastian/epcon,PythonSanSebastian/epcon,matrixise/epcon,malemburg/epcon,matrixise/epcon,EuroPython/epcon,EuroPython/epcon,artcz/epcon,matrixise/epcon,barrachri/epcon,barrachri/epcon,artcz/epcon,matrixise/epcon,artcz/epcon,malemburg/epcon,PythonSanSebastian/epcon,PythonSanSebastian/epcon,PythonSanSebastian/epcon,artcz/epcon,matrixise/epcon