Change swedish appendix title 'bilaga' to 'appendix'

Question

I'm writing a document in Swedish, and appendices are then called 'bilaga' which is a translation of 'appendix' not widely used in my field. Hence, I'd like the title in appendix A to read 'Appendix A' and not 'Bilaga A'. I've tried using \renewcommand\appendixname{Appendix} but it changes nothing. The toc is fine as it is - doesn't use the word Appendix or Bilaga at all, just A, B and so on.

EDIT: Don't know what a MWE is, but here are pieces of my latex code that I think may be relevant:

\documentclass[a4paper,11pt,fleqn,twoside,openright]{report}
\usepackage[swedish]{babel}
%...{lots of other stuff related to figures and page layout}
\usepackage{appendix}

\renewcommand\appendixname{Appendix}

\begin{document}

\chapter{oneone}

bla1 bla1

\chapter{twotwo}

bla

\appendix
\chapter{titel first appendix}

appendix text

\end{document}