The CRJ has a C Class. Donīt expext too much as flying with a CRJ is uncomfortable on any airline. You will get different food, magazines and a good assortment of beverages. On 737 and 320 a curtain divides the C and Y class section. There are only two seats on the left hand side, so you should try to get A or C.
There is a SEN lounge in CDG you can use as a *Gold (itīs in the satelite where the LH flights depart). In BCN Senators may use the JK (Spanair) lounge but Iīm not sure about UA members. Maybe someone else could help.