You can report on the total number and percentage of students who speak different languages, and a list of all the languages spoken at your school.
Percentage of Pupils who Speak Each Language
Go to Reporting > Reports > Students (tab) > School Summary
Select first language and choose.
Languages spoken in school
To report on languages in the school go to Reporting > Reports > Students and choose the report School Summary.
Now tick the box First Language and run the report by clicking on submit.
This will list each Language that is allocated to students in your system.