Closest cognate to Spanish "contento" is English "content," which implies long-term happiness, which "contento" apparently sometimes does not. Native speakers, feel free to prove me wrong.

con·tent
–noun
1. Usually, contents.
a. something that is contained: the contents of a box.
b. the subjects or topics covered in a book or document.
c. the chapters or other formal divisions of a book or document: a table of contents.
2. something that is to be expressed through some medium, as speech, writing, or any of various arts: a poetic form adequate to a poetic content.
3. significance or profundity; meaning: a clever play that lacks content.
4. substantive information or creative material viewed in contrast to its actual or potential manner of presentation: publishers, record companies, and other content providers; a flashy Web site, but without much content.
5. that which may be perceived in something: the latent versus the manifest content of a dream.
6. Philosophy, Logic . the sum of the attributes or notions comprised in a given conception; the substance or matter of cognition.
7. power of containing; holding capacity: The bowl's content is three quarts.
8. volume, area, or extent; size.
9. the amount contained.
translates to spanish as "contenido" not as contento.
Spanish contento translates to English as "happy."

Duplicates of this sentence have been deleted:
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