Changed some formatting.

frontbackmatter/Abstract.tex

@@ -8,14 +8,17 @@
 \let\cleardoublepage\relax
 \let\cleardoublepage\relax
 
+\begin{otherlanguage}{american}
 	\chapter*{Abstract}
 	Short summary of the contents in English\dots a great guide by
 	Kent Beck how to write good abstracts can be found here:
 	\begin{center}
 		\url{https://plg.uwaterloo.ca/~migod/research/beckOOPSLA.html}
 	\end{center}
+\end{otherlanguage}
 
-\vfill
+\newpage
+\cleardoublepage
 
 \begin{otherlanguage}{ngerman}
 	\pdfbookmark[1]{Zusammenfassung}{Zusammenfassung}