refactor(report): correct language

src/internship_report/main.tex

@@ -7,11 +7,11 @@
 \usepackage[driver=xetex]{geometry}
 \geometry{margin=1.5cm}
 % Choose [document language(s)](https://ctan.org/pkg/babel).
-\usepackage[english,ngerman]{babel}
+\usepackage[ngerman]{babel}
 % Enable [clickable hyperlinks in PDF](https://ctan.org/pkg/hyperref).
 \usepackage{hyperref}
 \usepackage[backend=biber,style=apa,natbib=true]{biblatex}
-\DeclareLanguageMapping{english}{english-apa}
+\DeclareLanguageMapping{german}{german-apa}
 \addbibresource{main_literature.bib}
 % Enhanced support for [graphics](https://ctan.org/pkg/graphicx).
 \usepackage{graphicx}