[pdftotext] fails at Umlaute

I upgraded my Linux Poppler to 0.86.1-1-x86_64 in the hope the failure to convert a PDF containing German Umlaute was a bug already solved. But unfortunately it is not so. pdftotext V0.86.1 creates the exact same erroneous txt file than the older most recent Slackware version 0.68.0. When reading the PDF using PDF Viewer 0.1.8 all Umlaute are displayed correctly.

While the created txt file is an UTF-8 coded file, the Umlaute are all messed up, e.g. Ü is converted into † and ö into š. The list goes on. The pdf is to be found on a wikipedia page and is freely accessible. https://de.wikipedia.org/wiki/Willkommen_und_Abschied ; the URL to the pdf is http://revistas.ucm.es/index.php/RFAL/article/download/RFAL0000110081A/33794 ; The filename is "34939-Texto del artículo-34955-1-10-20110610.PDF"