Improve haskell summary slide

VL1/content/VL1_what_is_haskell_summary.tex

@@ -4,6 +4,7 @@
 \item pure
 \item lazy
 \item \ifger{statisch typisiert (und typsicher)}{statically typed (and truly type-safe)}
+\item general purpose language
 \item \ifger{sogar}{even} garbage collected
 \item \ifger{die beste imperative Programmiersprache der Welt (was??)}{the world's finest imperative language (what??)}
 \end{itemize}