Kindly refer to the following link(s):
Dua in your own language in sujood and before making salam
Making dua in my mother tongue | By Assim Al Hakeem
Permissibility of making dua in your own language in Fard & Voluntary Prayers
Can I recite Sayyedul Isteghfar or Duas from Qur'an in Prostration (Sujood)? | Sheikh Assim Al Haeem