How to update Approval History label (Approved by Workflow System)?

When the employees leave auto-approved, the label 'Approved by Workflow System' is reflected under the approval history section in the bell icon notification, and the employee also receives it in the email. We have a business requirement to rename it as 'Approved'.

Let us know if this is feasible also assist with the navigation to find out the main-template and sub-template details (FusionHistoryRegion, FusionActionLinks, FusionLeftFooterLink, etc.)