Translation of login page: 'User Account' string not in messages.po file

Permalink
Hey there! I had some missing translation in my .po file, so I thought I'd do them manually, when I realized, that the login page 'User Account' string can not be found, even though it is properly wrapped in t(). Even brute force would not work: I delete the line and put my own echo statement in place of it and it still doesn't change. I am absolutelly clueless about what is going on here. I'm affraid that there could be other strings like this. Does anyone has some tips about this issue? Thanks!