Anyone knows how to turn off this message in safari 12 "Allow this website to use space on your disk?"

For the second time in three months, Google Translate is popping a window into my workspace with this message: "The website “https://translate.google.com” is requesting 50 MB of disk space to store “GoogleTranslateMobileWebApp” as a database on your disk. Currently, this website is allowed to use 50 MB of disk space" Whether I click "Allow" or "Don't Allow," nothing changes. The message keeps popping up and I have to click one of the two choices to be able to continue to use my keyboard. I don't remember how I got rid of it the last time. Maybe it was an iOS update. But I've searched and searched and the only I find is something about going into terminal and executing a command. I'm REALLY not at all confident that I won't screw up my computer totally by doing that, especially since this message from Google Translate seems to suggest I'm at the max disk space already allowed. Any help would be welcome as this is extremely annoying and slowing down my work. (I'm in masOS Mojave version 10.14.3)