Use language scopes

Use language scopes so that the language settings of the document are
not touched.

dictionary.sty

@@ -25,6 +25,5 @@
   \DTLsort{word}{dictionary}%
   \scriptsize%
   \DTLforeach*{dictionary}{\word=word,\translation=translation}{%
-    \selectlanguage{\@dictionary@primary}\textbf{\word:} \selectlanguage{\@dictionary@secondary}\translation\\}%
-  \selectlanguage{\@dictionary@primary}%
+    \foreignlanguage{\@dictionary@primary}{\textbf{\word:} }\foreignlanguage{\@dictionary@secondary}{\translation}\\}%
 }