The prayers (Salah) must be recited in Arabic as the Prophet Muhammad (SAWA) recited and ordered all Muslims: Pray as you saw me praying صلوا كما رأيتموني أصلي
If you mean by prayers the supplications (Du'a), it is allowed to recite Du'a in your preferable language. Even you are allowed to read within the Salah supplications in your own language, but that supplications should be along with Arabic parts of Salah.
In short, Salah must be in Arabic but Du'a can be in your referable language.
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