Change sentence with 'language built on acausal modeling'

Based on suggestion by Hans.

chapters/introduction.tex

@@ -3,7 +3,7 @@ \chapter{Introduction}\label{introduction1}
 \section{Overview of Modelica}\label{overview-of-modelica}
 
 Modelica is a language for modeling of cyber-physical systems, designed to support effective library development and model exchange.
-It is a modern language built on acausal modeling with mathematical equations and object-oriented constructs to facilitate reuse of modeling knowledge.
+It supports acausal modeling with mathematical equations and object-oriented constructs to facilitate modeling from first principles and reuse of modeling knowledge.
 It can be used conveniently for modeling complex systems containing, e.g., mechanical, electrical, electronic, magnetic, hydraulic, thermal, control, electric power or process-oriented subcomponents.
 
 \section{Scope of the Specification}\label{scope-of-the-specification}