The most important section for writing an exercise with WIRIS quizzes is the Algorithm field, consisting of a WIRIS cas section. This field is common to all types of question improved by WIRIS, since it includes the whole mathematical functionality of the exercise.
Right under the Algorithm field, there is a drop-down list where the available languages are listed.
When creating a new question, WIRIS cas will be displayed in the language set in Moodle, provided that the language is available. When you open an existing question, the language is stored in the exercise, so it will appear in the language used when it was saved.
If you wish to translate the algorithm to another language, you just have to select the language desired in the drop-down list. The page will reload automatically with the translated applet and commands.