[FEATURE] Language support

[kyleok]

Briefly describe the feature idea:
Describe your feature here, explain what it is and why it should be added.

names of the exercise appear randomly, some in English, some in Dutch
names from Dodona webpage itself appears in English but the plugin don't.
any possibility to add language option?

[thepieterdc]

Ah, that's odd; I'll look into it

[pdawyndt]

Same issue still occurs. I can't seem to get the English version of the exercises in the selection menu, and all links to Dodona always point to the Dutch version, even if the URL included in the soure file explicitly has the English language part in it.