I have translated the book's introduction:

https://media.churchmusicassociation.org/pdf/ordo-cantus-missae.pdf

The German version of the Liber Usualis has the title Der Katholische Pfarrgottesdienst Messe und Vesper der Sonn- und Festtage, lateinisch und deutsch. The 1958 edition was reprinted in 2018 in a nice gilt-edged edition with amendments and a larger format than the original No. 903. It was published by Sarto Verlagsbuchhandlung.

In 1909 Desclee published an edition of the Graduale (no. 696) with the Preface to the Vatican Edition in English and an additional 13 pages with translations of the Latin rubrics found throughout the volume. This latter section was titled, "Rubrics for the Laity".

If you mean the 1974 Graduale, a rough translation would read:

For all the celebrations of the saints, it is possible to choose either:
- the chants given below;
- others from the commons (as above pp. 397-530), according to the rubric in the Roman Missal for a given saint;
- or chants, either from the proper or the common, in the Graduale Romanum (1908 and later editions).

On solemnities and feasts, the Introit "Gaudeamus" can always be sung, if the proper words of the mystery or the saint to be celebrated can be inserted in the melody.

So as the third option above spells out, chants for saints' days do not have to be taken from the 1974 Graduale, but can be chosen instead from the 1908 Graduale, i.e., for saints' days you can sing the proper chants as they are sung in the TLM. Chants that could be chosen under the third option are listed in the 1988 Ordo Cantus Missae itself at pp. 155ff (n. 397ff).