On the Spanish end I found this link (not a source I already know) which says "Los salmos de la Biblia, también llamados en ocasiones como Alabanzas o Salterio" ... .
https://www.unprofesor.com/ciencias-sociales/que-son-los-sal...
This fits with an English equivalent found, except that your ST does not capitalise Alabanzas, hence my not being 100% sure this is what is meant in your text, though it seems likely.

If you Google el libro de los Tehilim/Himnos/Alabanzas como titulo para los salmos, you will find more mentions of Alabanzas as the title of the Book of Psalms.

The English equivalents I have found (from Bible Dictionaries and Commentaries recommended in Theological College) are:
The Illustrated Bible Dictionary (Part 3), Book of Psalms, III.Technical terms in the Psalter p.1295 "The title of the book in Hebrew is tehillîm, 'Songs of Praise', or 'Praises'."
Re the designations psalms, songs, etc. it goes on to say "Technical designations of psalms. The most frequent term is mizmôr, 'a psalm', a word which suggests the use of an instrumental accompaniment. 'A song' (šîr) is a more general term, not confined to worship. In the Psalter it is often coupled with mizmôr ... and there are 15 consecutive 'Songs of Ascents' (120-134), probably pilgrim songs or else processional songs for the festivals." ..."Other titles are 'a prayer' (...), 'a praise' or doxology (145) ...".

The Introduction to Tyndale Old Testament Commentaries, Psalms 1-72, by Derek Kidner p. 38, takes up the latter point:
"A Prayer (five psalms); A Praise (Ps.145). the plurals of these could serve as titles for entire collections of psalms..." It reiterates on its commentary on Psalm 72, verse 20 (p.257) that "It seems from this verse that the word prayers was the earliest collective term for the Psalms. They are now entitled 'Praises' in the Hebrew Bible."...

Old Testament Survey, p.430: "The title "Psalms" reflects the book's name in the LXX Psalmoi. ... The Greek words, from psallo "to pluck" were first used for the playing of a stringed instrument or for the instrument itself. Later they were used to describe the song (psalmos or collection of songs(psalterion). ...Although the closest Hebrew word to "psalm" would be mizmôr "a song sung to musical accompaniment", the actual Hebrew title is tehillîm "praises" or "songs of praise".

Praises, plural and capitalised, would therefore clarify that it is referring to the title of the Book of Psalms (generally attributed to King David, though it is known in scholarly circles that only about half were actually written by him). To my mind praise/praises without capitalisation suggest a general meaning of 'offering praise(s)' and would therefore be less accurate. Following the above line of thought, praise in the singular, would only refer to one psalm.

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Note added at 2 days 9 hrs (2021-09-03 01:53:30 GMT) Post-grading
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p.s. sorry I was writing this slowly as you closed the topic. I will add my further reference for completion's sake in case anyone needs it longer-term!

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Note added at 2 days 9 hrs (2021-09-03 02:08:51 GMT) Post-grading
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additional reference re hymns of praise:
A scholar called H.Gunkel (Lutheran - did a lot of work on the Book of Psalms https://en.wikipedia.org/wiki/Hermann_Gunkel) drew up a classification of the Psalms in which he refers to some of them as Hymns of Praise. His scholarship has been built on by much later scholarship. This is however seen from a Christian scholarly perspective, whereas the above is Judeo-Christian.

References re Hymns of Praise:
New Bible Commentary, p. 486 The Psalms in Worship The father of modern specialis psalm-study is Hermann Gunkel, Die Psalmen (Vandenhoek & Ruprecht, 1926) who set out to relate each psalm to the life-situation from which it emerged. He distinguished certain main categories:
(a) Hymns, poems like 8, 19, 29 which dwell on the greatness and attributes of God. ..."

The Illustrated Bible Dictionary p. 1296 The liturgical approach to the Psalter A landmark in the modern study of the Psalter was the work of H. Gunkel in the early decades of this century. To him it was all-important to start by distinguishing the different clasess (...) of psalms ... He found the following main types: Hymns of Praise, Personal Thanksgivings, Communal Laments and Personal Laments. In addition there were smaller categories... His classification has been widely adopted, and his insistence on the importance of such an approach seldom questioned.

If you think that your text is using alabanzas in a more general way, hymns of praise might therefore be fitting.

p.s. I couldn't post this as a separate reference for some reason, hence adding here.


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Note added at 2 days 9 hrs (2021-09-03 02:09:32 GMT) Post-grading
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Sorry about all the bold text above. As it was a note, I couldn't preview!