Here’s a polished, professional reply you can use:
Thank you for reaching out, and we apologize for the inconvenience.
Please note that the texts you are referring to are not language strings. They are part of the SP Page Builder addon content. To update these texts, please navigate to:
SP Page Builder → EasyStore → Single
Then edit the highlighted areas according to your preferences. You can refer to the following screenshot for guidance:
https://files.fm/u/73642b6z5t
If you need any further assistance, feel free to let us know.