Add date to cover page of UM and TRM

docs/tex_common/cover_page.tex

@@ -11,6 +11,7 @@
 	
 	\put(-10,-300){\bfseries\huge \title}
 	\put(-10,-330){\Large Authors: Christian Fibich, Stefan Tauner}
+	\put(-10,-350){\Large Last change: \today}
 
 	\put(250,-652){\includegraphics[height=84pt]{img/fiji_logo.pdf}}
 	\put(350,-650){\includegraphics[height=80pt]{img/fhtw_logo.pdf}}

docs/tex_common/header.tex

@@ -4,7 +4,8 @@
 
 \usepackage[utf8]{inputenc}
 \usepackage[T1]{fontenc}
-\usepackage[ngerman,english]{babel}
+\usepackage[english]{babel}
+\usepackage[iso,english]{isodate}
 \usepackage{enumerate}
 \usepackage[shortlabels]{enumitem}
 \setlist[description]{style=nextline}