espocrm-base/application/Espo/Resources/metadata/app/massActions.json

{
    "convertCurrency": {
        "implementationClassName": "Espo\\Core\\MassAction\\Actions\\MassConvertCurrency"
    },
    "follow": {
        "implementationClassName": "Espo\\Core\\MassAction\\Actions\\MassFollow"
    },
    "unfollow": {
        "implementationClassName": "Espo\\Core\\MassAction\\Actions\\MassUnfollow"
    },
    "recalculateFormula": {
        "implementationClassName": "Espo\\Core\\MassAction\\Actions\\MassRecalculateFormula"
    },
    "update": {
        "implementationClassName": "Espo\\Core\\MassAction\\Actions\\MassUpdate"
    },
    "delete": {
        "implementationClassName": "Espo\\Core\\MassAction\\Actions\\MassDelete"
    }
}