This simple plugin by Renaat Debleu helps make the process of differentiating instruction to students speaking different languages by adding a new Restrict Access criterion to activities and resources. While you could previously have completing this using groups/groupings, this simple addon creates a specific configuration to ensure that those students speaking English see the right resource and those speaking French see the right resource as well. According to the plugin
Language filters are great, but sometimes they can make your resources and activities very complex. This availability condition makes it easy to show an English resource only to English users and an activity in French only to French speaking students.