Update Italian and English free courses (#2834)

* Update free-courses-it.md

* Update free-courses-en.md

* Fix a typo

free-courses-en.md

@@ -260,6 +260,7 @@
 * [Bits: The Computer Science of Digital Information](http://www.extension.harvard.edu/open-learning-initiative/bits)
 * [Caltech's Learning From data](https://work.caltech.edu/telecourse.html)
 * [Computer Graphics](http://nptel.ac.in/courses/106106090/)
+* [Embedded Software Safety](https://www.youtube.com/playlist?list=PLAQopGWlIcyaqDBW1zSKx7lHfVcOmWSWt) (P. Koopman)
 * [FindLectures.com](https://www.findlectures.com/?class1=Technology) - Index of conference talks by language / topic
 * [LouvainX Paradigms of Computer Programming – Abstraction and Concurrency](https://www.edx.org/course/paradigms-computer-programming-louvainx-louv1-2x-1#!)
 * [LouvainX Paradigms of Computer Programming – Fundamentals ](https://www.edx.org/course/paradigms-computer-programming-louvainx-louv1-1x-1)
@@ -269,6 +270,7 @@
 * [MIT's Introduction to Algorithms](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-006-introduction-to-algorithms-fall-2011/)
 * [MIT's Mathematics for Computer Science](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-042j-mathematics-for-computer-science-fall-2010/video-lectures/)
 * [Principles of Reactive Programming](https://www.coursera.org/course/reactive)
+* [Robotics I](https://www.youtube.com/playlist?list=PLAQopGWlIcyaqDBW1zSKx7lHfVcOmWSWt) - (A. De Luca)
 * [Stanford Cryptography I](https://www.coursera.org/course/crypto)
 * [Stanford Cryptography II](https://www.coursera.org/course/crypto2)
 * [Stanford SEE 229 - Machine Learning](https://see.stanford.edu/Course/CS229)

free-courses-it.md

@@ -8,6 +8,8 @@
 ### Generale
 
 * [Informatica](https://didattica.polito.it/pls/portal30/sviluppo.videolezioni.vis?cor=232) - M. Mezzalama (Politecnico di Torino)
+* [Informatica I - Modelli dell'Informatica](https://www.youtube.com/playlist?list=PLAQopGWlIcyalkb2baN9mnotsdBm5Vbkc) - A. Marchetti Spaccamela (Università La Sapienza Università di Roma)
+* [Sistemi di Calcolo](https://www.youtube.com/playlist?list=PLAQopGWlIcybT12h7fjVvlGAeSqOKDnTA) - C. Demetrescu (Università La Sapienza di Roma)
 
 
 ### Programmazione