\documentclass[fontsize=12pt,twoside]{scrartcl}
\usepackage{fontspec}
\usepackage{polyglossia}
\usepackage{graphicx}
\usepackage{booktabs}
\usepackage{marginnote}
\usepackage[english=american,
  german=guillemets,
  autostyle]{csquotes}

\usepackage{scrlayer-scrpage}


\setmainlanguage[spelling=old,babelshorthands=true]{german}
\setotherlanguage[variant=polytonic]{greek}
\setotherlanguage{hebrew}
\setotherlanguage{coptic}
\setotherlanguage{sanskrit}

\defaultfontfeatures{Scale=MatchLowercase,Mapping=tex-text}

\setmainfont{Libertinus Serif}
\setsansfont{Libertinus Sans}
\setmonofont[Scale=0.90]{Courier}

%\newfontfamily\greekfont[FakeStretch=1.05,LetterSpace=1.3]{Times}
%\newfontfamily\hebrewfont[Scale=0.85]{Ezra SIL}
\newfontfamily\copticfont{Antinoou.ttf}%{Antinoou}
\newfontfamily\sanskritfont{Lohit-Devanagari.ttf}%{Lohit-Devanagari}

\setkomafont{disposition}{\normalcolor\bfseries}
\ihead{Autor: \emph{Text}}
\ohead{Kommentar Kapitel~\thesection}
\ofoot{\thepage}

\usepackage[backend=biber,style=authortitle-dw]{biblatex}
\bibliography{biblatex-examples.bib}

\DeclareFieldFormat*{citetitle}{\mkbibemph{#1}}
\DeclareFieldFormat*{title}{\mkbibemph{#1}}
\DeclareFieldFormat*{booktitle}{\mkbibemph{#1}}
\DeclareFieldFormat*{maintitle}{\mkbibemph{#1}}
\DeclareFieldFormat*{addendum}{\mkbibbrackets{#1}}
%\DefineBibliographyStrings{german}{
%  thiscite = {hier},
%  sequens = {f},
%  sequentes = {ff},
%}
%\renewcommand*{\sqspace}{}% kein leerzeichen _vor_ "f"/"ff"


\AtBeginBibliography{%
  \renewcommand*\mkbibnamegiven[1]{\textbf{#1}}%
  \renewcommand*\mkbibnamefamily[1]{\textbf{#1}}%
  \renewcommand*\mkbibnameprefix[1]{\textbf{#1}}%
  \renewcommand*\mkbibnamesuffix[1]{\textbf{#1}}%
}

%
\newcommand{\quotewithtrans}[4][\small]{%
  \begin{quote}
    #1%
    \begin{#2}
      #3%
    \end{#2}

    #4
  \end{quote}
}

\usepackage{duckuments}

\begin{document}
\subsection*{Überschrift}

Text text text text \enquote{Zitat Zitat Zitat}
\emph{kursiv}
text text ...

\textbf{\textgreek{συγγραφέως}:} Text text text
\begin{enumerate}
\item erster Punkt
\item zweiter Punkt
\end{enumerate}


\quotewithtrans{greek}{%
  Καὶ ἐκπορευομένου αὐτοῦ ...
}{%
  Deutscher Text...\footcite[Zitiert nach][380]{sigfridsson}
}

\quotewithtrans{coptic}{%
  ⲧⲙⲛ̄ⲧⲉⲣⲟ ⲉⲥⲧⲛ̄ⲧⲱⲛ ⲉⲩⲣⲱⲙⲉ
}{%
  Deutscher Text...
}

\quotewithtrans{hebrew}{%
  אמר לחד אית לך בר אמר ליה הין אמר לחד אית לך ברתא אמר ליה הין אמר אסיבו להון ויהא ממונא לתרויהון מה יתיב גביה
}{%
  Deutscher Text...
}

Sanskrit \textsanskrit{ब्राह्मण}

\duckument[full]
\end{document}