How to be i18n - PartidoDeLaRed/NetID GitHub Wiki
SonataAdminBundle Translations
To translate SonataAdminBundle keys, you must add them in /app/Resources/SonataAdminBundle/translations/SonataAdminBundle.es.yml file.
It must be that location and that file as Symfony uses the files located in that directory and in this case they belong to SonataAdminBundle domain.
Custom translations
If you want to translate any other word inside you own bundle, then you must create translate file in your bundle, for example:
app/Resources/translations/messages.[your_language].yml