Reading in English

To read a novel in a second language is no easy task, well done, your practise is clearly showing in your writing as it is excellent. Charlotte 

Reading in English

This is the opposite problem to the wall one. "Which is" (or "that is") is for inanimate objects, "who is" is for people.

Reading an author's work in their native language is my everlasting dream, and now it comes true.

1/ Remember that in English you need to use the apostrophe then s to indicate single possession. In this case, whose work is it? An author's.

2/ You used the gerund form when you said "reading"; it would sound more natural to use the gerund form all the way through. "and now it is coming true". "And now it comes true" isn't completely wrong but is not how a native speaker would say it.

I can't believe I can do it. What makes me more than happy , is that I feel the pleasure of reading, and I'm not only concentrating on the comprehension. I highlight the sentences I prefer and I want to share, as I do with my native language.

I don't have a Kindle but I use Kindle's App the Kindle app on my tablet and it is very usefull useful.

The app isn't Kindle's; Kindle is just a brand name of Amazon. In this case you do need "the" to specify that the particular app that you're referring to is the Kindle one. You capitalise Kindle since it is a proper noun (the name of a product) but not app because it is a common noun.

There is a dictionary, and the possibility to create flash cards, which can be used to learn new words.
What about the novel? I've just started reading it! I'll tell you about Fannie Flagg and her novel in another notebook!

Brava.