Hi, I have on my site in French this button which is the only one in English and I cannot find where to translate it into French (texts string section does not show it):
Maybe it’s a theme component? Does the button disappear when you disable themes in safe mode?
Actually, yes it disappears in safe mode.
So disable your theme components one by one (or a few at a time if there are many) and see which one it is.
The culprit was discourse-scroll-buttons, solved thanks !