I am trying to use a politically correct term to refer to any language (also known as dialect) used by a minority group in LA. Some ideas I have are idiomas de minorías or lenguas indígenas, but I don't know if there is a better term for this.
You can use "lenguas minoritarias", to refer to languages spoken by minority groups, or "minorías lingüísticas," to refer to the groups speaking those languages.
I expand that besides the proposed "minoritarias", you can also use
Lenguas de minorías (source in Google Books)