Set languages via package options

To define the languages for the dictionary the package options primary
and secondary have to be set.

CHANGELOG.md

@@ -9,5 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Set the languages of the dictionary by using the package options
+  `primary` and `secondary`.
 - Create the `dictionary` environment where the
   `\entry{word}{description}` command can be used.

dictionary.sty

@@ -4,6 +4,15 @@
 \RequirePackage{babel}
 \RequirePackage{datatool}
 
+\DeclareKeys[dictionary]{
+  primary.store = \@dictionary@primary,
+  secondary.store = \@dictionary@secondary
+}
+
+\ProcessKeyOptions[dictionary]
+
+\PassOptionsToPackage{\@dictionary@primary,\@dictionary@secondary}{babel}
+
 \newcommand{\entry}[2]{%
   \DTLnewrow{dictionary}%
   \DTLnewdbentry{dictionary}{word}{#1}%
@@ -16,6 +25,6 @@
   \DTLsort{word}{dictionary}%
   \scriptsize%
   \DTLforeach*{dictionary}{\word=word,\translation=translation}{%
-    \selectlanguage{vietnamese}\textbf{\word:} \selectlanguage{naustrian}\translation\\}%
+    \selectlanguage{\@dictionary@primary}\textbf{\word:} \selectlanguage{\@dictionary@secondary}\translation\\}%
-  \selectlanguage{vietnamese}%
+  \selectlanguage{\@dictionary@primary}%
 }