Edit second title SAP Fiori

Hello,

I would like to change the optional second title (

https://experience.sap.com/fiori-design-web/shell-bar/#branding-area-and-second-title )

of my SAP Fiori:

I already found this question, but I can't find an i18n file and I also tried to change the title to "some text" in manifest.json but nothing happened:

"sap.app": {
    "id": "sap.ushell",
    "type": "library",
    "applicationVersion": {
      "version": "1.52.18"
    },
    "title": "Some Text",
    "description": "Description",
...
}

Thanks for your feedback.