Removed legacy code in localTheorem.sty.

localTheorem.sty

@@ -19,20 +19,6 @@
 \RequirePackage{etoolbox}
 \RequirePackage{xifthen}
 \RequirePackage{expl3}
-\ExplSyntaxOn
-%% workaround for syntax change in newer expl3 implementations
-\cs_if_exist:NF \prg_case_str:nnn
-  { \cs_new_eq:NN \prg_case_str:nnn \str_case:nnn }
-\cs_if_exist:NF \str_case:nnn
-  { \cs_new_eq:NN \str_case:nnn \prg_case_str:nnn }
-%% workaround for a temporary problem (july 2015)
-\cs_if_exist:NF \str_case:nnn
-  { \cs_new_eq:NN \str_case:nnn \str_case:nnF }
-\cs_if_exist:NF \str_case_x:nnn
-  { \cs_new_eq:NN \str_case_x:nnn \str_case_x:nnF }
-\cs_if_exist:NF \int_case:nnn
-  { \cs_new_eq:NN \int_case:nnn \int_case:nnF }
-\ExplSyntaxOff
 
 \@ifclassloaded{beamer}{}{\let\openbox\@undefined}
 
@@ -133,8 +119,7 @@
 } %%% end parskip-sensitive stuff %%%
 
 \ExplSyntaxOn
-\newcommand{\localTheorem@temp}[1]{
-\str_case:nnn{#1}{
+\str_case:onF{\localTheorem@language}{
 {english} {
   \@newtheorem{lemma}{Lemma}
   \@newtheorem{theorem}{Theorem}
@@ -184,6 +169,5 @@
   \newtheorem{exercise}{}[\localTheorem@exerciseswithin]
   \providecommand*{\exerciseautorefname}{Übung}
 }
-}{\PackageError{localTheorem}{Unknown~language:~#1}\@ehc}}
+}{\PackageError{localTheorem}{Unknown~language:~\localTheorem@language}\@ehc}
 \ExplSyntaxOff
-\expandafter\localTheorem@temp\expandafter{\localTheorem@language}