Purpose Of Salah If Not Done In Own Language
Tadabbur without the original text does not qualify to be a meritorious tadabbur. if recitation in some other language is allowed, we will pave the way to ignore the original text which has no substitute. No translation can be an agreed upon translation, so it will also arise disputes, as we see in scholarly circles. so it is not recommended to recite Quran during prayer in some other language.