Making Dua In Your Own Language During Salah
Obligatory rituals and utterances are substantiated by the consensus of the Companions (rta) and the perpetual adherence (tawatur) of the ummah to these rituals and utterances. Everything else is optional and can be done even in one’s own language because nothing has been fixed by the Prophet (SWS) in this regard . Please refer to the following response by Ghamidi Sahab from 1:19:30 to 1:22:28 https://youtu.be/E8GtA-QqF_Y?t=4770
Please also refer to the following responses by Dr. Irfan Shahzad : Discussion 79389 Discussion 80430