always include german AND english

the option 'german' just changes the default language

tex/header/stdmath.sty

@@ -74,7 +74,7 @@
 % maybe that works one day:
 % \RequirePackage{polyglossia}
 % \ifopt@german{\setdefaultlanguage{german}}\else{\setdefaultlanguage{english}}\fi
-\RequirePackage[\ifopt@german ngerman \else english \fi]{babel}
+\RequirePackage[\ifopt@german english,ngerman \else ngerman,english \fi]{babel}
 \RequirePackage{amsmath, amsfonts} 
 \RequirePackage{aligned-overset}  % for nicely aligned text over relation symbols
 % with \overset{\text{Definition}}&{=} instead of &\stackrel{\text{Definition}}=