Do I need to provide an English language certificate?

Yes. 

IELTS minimum 6,0 points,
TOEFL minimum 90 points,
CEFR B2 level,
or
TOEIC minimum 700 points.

Deadline to submit document to Admission Office: Friday, Aug. 30, 2019. 

The Admission Office does not issue an acceptance letter until this requirment is fulfilled. 

This requirement does not concern native speakers or qualified candidates who completed their high school education in an English speaking education system, however, the latter must be confirmed in writing by their high school.