Haha, I just had a look at some other book I have lying around here and realised that my problem was not a real problem.
Thank you anyway, I've learned something new today

Code: Select all
\documentclass[12pt,a4paper,twoside]{article}
\usepackage{amsmath}
\renewcommand\contentsname{Innholdsfortegnelse}
\begin{document}
Hello!
\newpage
Hello!
\end{document}
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