With XeLaTeX the ToC with Swedish settings says Content, not Innehåll
When running make with texlive (2019) locally the demo_student_thesis says Content instead of Innehåll. If I in the .tex, after \begin{document}, write \tableofcontents it says Innehåll.
I also tried with Overleaf XeLaTeX and TeX Live version 2020, same problem. However, Overleaf with XeLaTeX 2016–2019 works. I also tried texlive 2016 locally and it worked.
There is no problem when using pdfLaTeX.