What should this conversation between Tiffany Aching and Preston mean?

Question

At the end of the book I Shall Wear Midnight, this strange conversation takes place:

He said, ‘Miss Tiffany, the witch … would you be so good as to tell me: what is the sound of love?’
Tiffany looked at his face. The noise from the tug-of-war was silenced. The birds stopped singing. In the grass, the grasshoppers stopped rubbing their legs together and looked up. The earth moved slightly as even the chalk giant (perhaps) strained to hear, and the silence flowed over the world until all there was was Preston, who was always there.
And Tiffany said, ‘Listen.’

I don't understand what Tiffany means by that. Of course, I got the message that

they love each other,

but still why ‘Listen’? That makes no sense to me. I have to add that I read the book in Czech and there it is slightly different:

The boy is called similarly (Přestůň [pr̝̊estu:ɲ]) and she says that the sound of love is ‘Přesto’ [pr̝̊esto] which means "regardless", "in spite of", "still" or "even so".

That sounds pretty different and it is even more confusing for me, than the English version itself.

Answer 1

She means “if you want to know what love sounds like then listen right now because there’s love right here because I love you.”

As for "Přesto", that would be what is known as a pune, or play on words.

Answer 2

Regarding the "Přesto" -translation. Others have commented that it is a pune, or play on words, but without further comments on it. My knowledge of Czech is also non-existent, but I believe that the translator is using similar sounding Czech word for Presto, which comes from the Italian/Latin word for quickly (also used as musical term for quick tempo, so it's globally known).

It also has other usage, quoting Merriam-Webster on Presto here:

used to indicate the sudden appearance or occurrence of something often as if by magic

That would make the translators pune a reference to how suddenly the sound of love appeared at that moment.

Answer 3

Regarding the Czech version: when Tiffany meets her older self in the last chapter, she starts asking her "Jako čarodějka, budu mít někdy -", "As a witch, will I ever have -". Presumably she's asking about having a lover/husband in future. Older Tiffany is already disappearing when responding, and younger Tiffany only hears "Přesto...", which, as already said, means "regardless", "in spite of", "still", "even so". It seems that the whole response could be something like "Even if you are a witch, you will have somebody to love."

Now, in Czech, somebody called Přestůň (Preston), when talked to, would be addressed "Přestůni", or possibly "Přesto", which would be a more personal addressing. I can imagine Tiffany calling him Přesto. (I am being subjective here since Přestůň of course is not a real Czech name.)

So maybe it is at the moment when Přestůň asks her what the sound of love is when Tiffany realizes that her older self gave her the answer, and that it wasn't "in spite of", as she thought, but "Přesto", a way to address her loved one. Calling him by his name is the sound of love.

This is just my interpretation of course.