input: Expanded use of Vernacular: "Since the use of the mother tongue, whether in the Mass, the administration of the sacraments, or other parts of the liturgy, frequently may be of great advantage to the people, the limits of its employment may be extended." (Sacrosanctum Concilium 36.2) [Things to think about] 
output: Vatican II did not outlaw Latin. The Sacrosanctum says: "... steps should be taken so that the faithful may also be able to say or to sing together in Latin those parts of the Ordinary of the Mass which pertain to them." (Sacrosanctum Concilium 36) "it is for the competent territorial ecclesiastical authority ... to decide whether, and to what extent, the vernacular language is to be used; ... confirmed, by the Apostolic See ...consult with bishops of neighboring regions which have the same language. (Sacrosanctum Concilium 36.3)