Customise "Use x minutes of my quota time now"

Hello guys

I successfully implemented a time quota in a specific category for my kids. 

If I go to Web --> User notifications, I see that I can customize the messages for the block pages.

I did it , but I see no way to customize "Use x minutes of my quota time now"

I don't actually need to customize the page using any custom logos or anything (it is for home use). In my case customizing essentially means that I need to translate it.

You see I am Greek and the messages are in English..So I thought about translating the messages to Greek to make it easier for the kids

I translated the remaining text by "customizing" it, however the part "Use x minutes of my quota time now" cannot be customized. So the whole block page is in Greek, except from this specific phrase

Is this a known bug that is going to be fixed, or is this customization restricted for some reason ?(i don't think so though..)

Thanks