Yaml file

Hello ! I need help for YAML files. I have several files to analyse. I've downloaded the YAML file type. Everything went fine for all of them except 4 files. Apparently the problem is that the source text have not been duplicated :
example below :
this file is OK :'Mail d''activation renvoyé': '__Mail d''activation renvoyé'
'Informations personnelles mises à jour': '__Informations personnelles mises à jour'

this file is not OK :
'Envoyer un questionnaire à tous leurs amis': ''
'Bonne idée ! Il faudra par contre pensez à vérifier qu''ils sont dans la cible.': ''

How can I deal with this problem ? I can't just manually duplicate the text as this file is huge !

Thanks for your help !