\documentclass[a4paper,11pt,twoside]{book}
\usepackage{ae,aecompl}
\usepackage[T1]{fontenc}
-\usepackage[latin1]{inputenc}
+\usepackage[utf8]{inputenc}
%\usepackage[tex4ht, bookmarks=true]{hyperref}
\usepackage[bookmarks=true,plainpages=false,pdfpagelabels,hyperfootnotes=false]{hyperref}
\usepackage{makeidx}