The song is sung in Hindi. Ragib Hasan states [Bangla] that an Indian Government website claims that the hindi version of Tagore's song was taken as the national anthem of India.
But Ragib shows that it is actually the Bangla text pronounced in Hindi accent. No Hindi adaptation was done (note: Hindi and Bangla language have same roots) and nore there was any formal decision of the Indian Government regarding this.
He asks whether Indian Government has any problem in admitting that the song is in Bengali language but sung in Hindi accent?