added english translation

Reviewed-on: #1

quiz_module.gd

@@ -51,7 +51,7 @@ func _ready() -> void:
 
 func set_question() -> void:
 	# Set texts
-	var full_question_text = question + "\na) "+answer_0+ "\nb) "+answer_1+ "\nc) "+answer_2+ "\nd) "+answer_3 + "\n"
+	var full_question_text = tr(question) + "\na) "+tr(answer_0)+ "\nb) "+tr(answer_1)+ "\nc) "+tr(answer_2)+ "\nd) "+tr(answer_3) + "\n"
 	question_label.text = full_question_text
 	question_panel.visible = true