Regarding the bold, red text (my emphasis) above, that was
not the work of the Council.
The Constitution on the Sacred Liturgy,
Sacrosanctum Concilium, stated the following:36. 1. Particular law remaining in force,
the use of the Latin language is to be preserved in the Latin rites.
2. But 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. This will apply in the first place to the readings and directives, and to
some of the prayers and chants, according to the regulations on this matter to be laid down separately in subsequent chapters.
(snip)
- In Masses which are celebrated with the people, a suitable place may be allotted to their mother tongue. This is to apply in the first place to the readings and “the common prayer,” but also, as local conditions may warrant, to those parts which pertain to the people, according to the norm laid down in Art. 36 of this Constitution. **Nevertheless 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. **
And wherever a more extended use of the mother tongue within the Mass appears desirable, the regulation laid down in Art. 40 of this Constitution is to be observed.
(snip)
- Liturgical worship is given a more noble form when the divine offices are celebrated solemnly in song, with the assistance of sacred ministers and the active participation of the people.
As regards the language to be used, the provisions of
Art. 36 are to be observed; for the Mass,
Art. 54; for the sacraments, Art. 63; for the divine office. Art. 101.
Sadly, so few clerics have been given serious instruction in Latin in recent decades, it would be very difficult to fix this any time soon. I understand that this is in process of being corrected in many seminaries, but it will be a tough slog for a while.