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\usepackage[ngerman]{babel}
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%\renewcaptionname{german}{\tablename}{Tab.}

\renewcaptionname{ngerman}{\contentsname}{Inhalt}           %Table of contents
\renewcaptionname{ngerman}{\listfigurename}{Abbildungen}    %Figures
\renewcaptionname{ngerman}{\listtablename}{Tabellen}        %Tables
\renewcaptionname{ngerman}{\figurename}{Abb.}               %Figure
\renewcaptionname{ngerman}{\tablename}{Tab.}                %Table
\renewcaptionname{ngerman}{\bibname}{Literatur}             %Bibliography
  \newcaptionname{ngerman}{\lstlistlistingname}{Quelltexte} %Table of listings 
  \newcaptionname{ngerman}{\lstlistingname}{Quelltext}      %Listing