5.A.3 Language for the Celebration of Sacraments and Sacramentals
1. When liturgical services are celebrated with the faithful with a common language other than English, permission is given to use the language known to them, especially in the case of immigrants, members of a personal parish, or similar circumstances. 
a. Approved liturgical books or texts are to be used, and any questions regarding approval are to be submitted to the diocesan bishop for his review. (See #5.A.2 Texts and Rites of Liturgical Celebrations.)
b. The minister must be sufficiently competent in that language.
2. A priest may provide for Mass to be celebrated in Latin according to the Roman Missal of Pope Paul VI  (the Ordinary Form) under the following conditions:
a. He considers that it meets a pastoral need.
b. Sufficient catechesis and instruction is provided so that there is full and active participation by the people. 
c. The priest who celebrates the Mass possesses sufficient facility in Latin. 
 Sacred Congregation for Rites, Instruction for the Proper Implementation of the Constitution on the Sacred Liturgy (September 26, 1964) n. 41, AAS 56-877 in Canon Law Digest 6:83.
 Missale Romanum, editio typica tertia emendata.
 SC, n. 14.
 RS, n. 112. Also see c. 928.