Changing text not included in translations

Hi,

I want to change the text in checkout step 4, that says: "Please select the shipping method"

I can't find this text in the translations. ESHOP_SHIPPING_METHOD_TITLE is different, I changed it, but the above text is still there.

Also I searched through the entire eshop package and database, this text doesn't seem to be anywhere.

So, a hint where I can find it would be great!