Canon 838. §1 The ordering and guidance of the sacred liturgy depends solely upon the authority of the Church, namely, that of the Apostolic See and, as provided by law, that of the diocesan Bishop.

§2 It is for the Apostolic See to order the sacred liturgy of the universal Church, publish liturgical books, recognise adaptations approved by the Episcopal Conference according to the norm of law, and exercise vigilance that liturgical regulations are observed faithfully everywhere.
[revised wording according to m.p. Magnum principium, 3.IX.2017]

§3 It pertains to the Episcopal Conferences to faithfully prepare versions of the liturgical books in vernacular languages, suitable accommodated within defined limits, and to approve and publish the liturgical books for the regions for which they are responsible after the confirmation of the Apostolic See.
[revised wording according to m.p. Magnum principium, 3.IX.2017]

§4 Within the limits of his competence, it belongs to the diocesan Bishop to lay down for the Church entrusted to his care, liturgical regulations which are binding on all.

§1. Sacrae liturgiae moderatio ab Ecclesiae auctoritate unice pendet: quae quidem est penes Apostolicam Sedem et, ad normam iuris, penes Episcopum dioecesanum.

§2. Apostolicae Sedis est sacram liturgiam Ecclesiae universae ordinare, libros liturgicos edere, aptationes, ad normam iuris a conferentia Episcoporum approbatas, recognoscere, necnon advigiliare ut ordinationes liturgicae ubique fideliter observentur.

§ 3. Ad Episcoporum Conferentias spectat versions librorum liturgicorum in linguas vernaculas fideliter et convenienter intra limites definitos accommodatas parare et approbare atquae libros liturgicos, pro regionibus ad quas pertinent, post confirmationem Apostolicae Sedis edere.

§4. Ad Episcopum dioecesanum in Ecclesia sibi commissa pertinet, intra limites suae competentiae, normas de re liturgica dare, quibus omnes tenentur.