ON THE USE OF VERNACULAR LANGUAGES IN THE PUBLICATION OF THE BOOKS OF THE ROMAN LITURGY
Congregation for Divine Worship and the Discipline of the Sacraments
FIFTH INSTRUCTION “FOR THE RIGHT IMPLEMENTATION OF THE CONSTITUTION ON THE SACRED LITURGY OF THE SECOND VATICAN COUNCIL” (Sacrosanctum Concilium, art. 36)
1. The Second Vatican Council strongly desired to preserve with care the authentic Liturgy, which flows forth from the Church’s living and most ancient spiritual tradition, and to adapt it with pastoral wisdom to the genius of the various peoples so that the faithful might find in their full, conscious, and active participation in the sacred actions – especially the celebration of the Sacraments – an abundant source of graces and a means for their own continual formation in the Christian mystery.[1]
2. Thereupon there began, under the care of the Supreme Pontiffs, the great work of renewal of the liturgical books of the Roman Rite, a work which included their translation[2] into vernacular languages, with the purpose of bringing about in the most diligent way that renewal of the sacred Liturgy which was one of the foremost intentions of the Council.
3. The liturgical renewal thus far has seen positive results, achieved through the labor and the skill of many, but in particular of the Bishops, to whose care and zeal this great and difficult charge is entrusted. ....
For this reason, even while calling for the revision of the various Rites in accordance with sound tradition, the Council set forth the principle that only those changes were to be introduced which would foster their specific organic development...
Clearly, the same vigilance is required for the safeguarding and the authentic development of the liturgical rites, the ecclesiastical traditions, and the discipline of the Latin Church, and in particular, of the Roman Rite. The same care must be brought also to the translation of the liturgical texts into vernacular languages. This is especially true as regards the Roman Missal, which will thus continue to be maintained as an outstanding sign and instrument of the integrity and unity of the Roman Rite...
The work of inculturation, of which the translation into vernacular languages is a part, is not therefore to be considered an avenue for the creation of new varieties or families of rites; on the contrary, it should be recognized that any adaptations introduced out of cultural or pastoral necessity thereby become part of the Roman Rite, and are to be inserted into it in a harmonious way...
In fact, it seems necessary to consider anew the true notion of liturgical translation in order that the translations of the Sacred Liturgy into the vernacular languages may stand secure as the authentic voice of the Church of God...
I. ON THE CHOICE OF VERNACULAR LANGUAGES TO BE INTRODUCED INTO LITURGICAL USE 10. To be considered first of all is the choice of the languages that it will be permissible to put into use in liturgical celebrations. It is appropriate that there be elaborated in each territory a pastoral plan that takes account of the spoken languages there in use, with a distinction being made between languages which the people spontaneously speak and those which, not being used for natural communication in pastoral activity, merely remain the object of cultural interest. In considering and drafting such a plan, due caution should be exercised lest the faithful be fragmented into small groups by means of the selection of vernacular languages to be introduced into liturgical use, with the consequent danger of fomenting civil discord, to the detriment of the unity of peoples as well as of the unity of the particular Churches and the Church universal...
20. The Latin liturgical texts of the Roman Rite, while drawing on centuries of ecclesial experience in transmitting the faith of the Church received from the Fathers, are themselves the fruit of the liturgical renewal, just recently brought forth. In order that such a rich patrimony may be preserved and passed on through the centuries, it is to be kept in mind from the beginning that the translation of the liturgical texts of the Roman Liturgy is not so much a work of creative innovation as it is of rendering the original texts faithfully and accurately into the vernacular language. While it is permissible to arrange the wording, the syntax and the style in such a way as to prepare a flowing vernacular text suitable to the rhythm of popular prayer, the original text, insofar as possible, must be translated integrally and in the most exact manner, without omissions or additions in terms of their content, and without paraphrases or glosses. Any adaptation to the characteristics or the nature of the various vernacular languages is to be sober and discreet.[20]
*One can't pit the Magisterium against itself. It is clear Mass in the vernacular is here to stay - which was what Latin Mass was - Mass in the vernacular.
Mass in the vernacular is Tradition. I know this comes as a shock to some.