BTW, here is a solution how to solve problem using ordinary Python staff (sure, I'm aware that is probably far from optimal 
)
)video_info = 'Réalisation :\nPierre Lazarus\nScénario :\nEmmanuelle Moreau\nNoémie Parreaux\nProduction :\nFilmakademie Baden-Württemberg\nSWR\nARTE\nProducteur/-trice :\nGiacomo Vernetti Prot\nJennifer Miola\nImage :\nHovig Hagopian\nMontage :\nMathieu Pluquet\nMusique :\nLouis-Ronan Choisy'
video_info_list = video_info.split('\n')
list_keys = []
list_values = []
for item in video_info_list:
if item[-1] == ':':
list_keys.append(item[:-2])
new_key = True
else:
if new_key:
list_values.append(item)
else:
list_values[-1] = list_values[-1] + ', ' + item
new_key = False
video_dict = dict(zip(list_keys, list_values))
for k, v in video_dict.items():
print(f"{k:<20}{v}")