diff --git a/data/tuto3-1/vtt/tuto3-activite1-vid1-en.vtt b/data/tuto3-1/vtt/tuto3-activite1-vid1-en.vtt
index 80aef9d7e1bf71cd2bfa01fd7d45a2424a06b553..1cd1ea4a81276fae3c5dd64be562757db66d1c98 100644
--- a/data/tuto3-1/vtt/tuto3-activite1-vid1-en.vtt
+++ b/data/tuto3-1/vtt/tuto3-activite1-vid1-en.vtt
@@ -1,31 +1,55 @@
 WEBVTT
-Kind: captions
-Language: en-GB
 
-00:00:00.000 --> 00:00:02.017
-To create images, A.I. relies on very special Neural Networks....
+00:00:04.528 --> 00:00:07.349
+To create images, artificial intelligence
 
-00:00:02.017 --> 00:00:08.017
-Generative Adversarial Networks, better known as GAN.
+00:00:07.349 --> 00:00:09.771
+relies on very special Neural Networks…
 
-00:00:09.017 --> 00:00:12.017
-The GAN is a kind of abracadabra brawler for creating images.
+00:00:09.771 --> 00:00:12.261
+Generative Adversarial Networks,
 
-00:00:13.017 --> 00:00:15.017
-GAN consists of two neural networks competing against each other
+00:00:12.261 --> 00:00:14.031
+better known as GAN.
 
-00:00:16.017 --> 00:00:19.017
-- the generator , - the discriminator.
+00:00:14.031 --> 00:00:16.670
+The GAN is a kind of abracadabra brawler
 
-00:00:20.017 --> 00:00:26.017
-The two neural networks compete against each other and one tries to fool the other.
+00:00:16.670 --> 00:00:18.055
+for creating images.
 
-00:00:27.017 --> 00:00:31.017
-The task for the generator is to generate thousands and thousands of new images.
+00:00:18.055 --> 00:00:20.729
+GAN consists of two neural networks
 
-00:00:32.017 --> 00:00:36.017
-For the discriminator, it is to know wether the image is generated or not.
+00:00:20.729 --> 00:00:22.135
+competing against each other
 
-00:00:37.017 --> 00:00:41.017
-And you, are you a good neural network ? Will you be able to flush out the AI ?
+00:00:22.135 --> 00:00:24.621
+the generator, the discriminator.
 
+00:00:24.621 --> 00:00:26.604
+The two neural networks
+
+00:00:26.604 --> 00:00:28.074
+compete against each other
+
+00:00:28.074 --> 00:00:30.111
+and one tries to fool the other.
+
+00:00:30.111 --> 00:00:33.000
+The task for the generator is to generate
+
+00:00:33.000 --> 00:00:35.525
+thousands and thousands of new images.
+
+00:00:35.525 --> 00:00:37.830
+For the discriminator, it is to know
+
+00:00:37.830 --> 00:00:40.194
+whether the image is generated or not.
+
+00:00:40.194 --> 00:00:42.920
+And you, are you a good neural network?
+
+00:00:42.920 --> 00:00:45.703
+Will you be able to flush out the AI?
diff --git a/data/tuto3-1/vtt/tuto3-activite1-vid2-en.vtt b/data/tuto3-1/vtt/tuto3-activite1-vid2-en.vtt
index 7d29e69c7fbbed88e7e4b3796d377e589b64df77..65516b8fe23befb73b258c9eb99b43221ca27b2f 100644
--- a/data/tuto3-1/vtt/tuto3-activite1-vid2-en.vtt
+++ b/data/tuto3-1/vtt/tuto3-activite1-vid2-en.vtt
@@ -1,43 +1,64 @@
 WEBVTT
-Kind: captions
-Language: en-GB
 
-00:00:00.001 --> 00:00:03.600
-So, are you a good discriminating neural network?
+00:00:04.397 --> 00:00:06.150
+So, are you a good
 
-00:00:03.600 --> 00:00:08.750
-Each time the generated image is considered as real by the discriminator network,
+00:00:06.150 --> 00:00:08.096
+discriminating neural network?
 
-00:00:08.750 --> 00:00:13.634
-the generative network reinforces its parameters and progressively improves.
+00:00:08.096 --> 00:00:10.670
+Each time the generated image is considered
 
-00:00:13.634 --> 00:00:17.817
-Some elements of the image can particularly betray a generative AI:
+00:00:10.670 --> 00:00:12.559
+as real by the discriminator network,
 
-00:00:17.817 --> 00:00:19.800
+00:00:12.559 --> 00:00:14.619
+the generative network reinforces
+
+00:00:14.619 --> 00:00:17.293
+its parameters and progressively improves.
+
+00:00:17.293 --> 00:00:19.230
+Some elements of the image
+
+00:00:19.230 --> 00:00:21.920
+can particularly betray a generative AI:
+
+00:00:21.920 --> 00:00:23.807
 the background of the image,
 
-00:00:19.800 --> 00:00:21.767
+00:00:23.807 --> 00:00:24.865
 the teeth,
 
-00:00:21.767 --> 00:00:23.817
+00:00:24.865 --> 00:00:27.645
 the asymmetry of the face or eyes,
 
-00:00:23.817 --> 00:00:25.884
+00:00:27.645 --> 00:00:30.000
 unexpected blurred areas,
 
-00:00:25.884 --> 00:00:30.700
+00:00:30.000 --> 00:00:31.840
 a hair a bit strange.
 
-00:00:30.700 --> 00:00:34.900
-If you look carefully, the images generated by GANs are still recognisable,
+00:00:31.840 --> 00:00:33.524
+If you look carefully,
+
+00:00:33.524 --> 00:00:35.565
+the images generated by GANs
 
-00:00:34.900 --> 00:00:40.717
-but these bugs may well be corrected in the years to come and it will be increasingly difficult to distinguish them!
+00:00:35.565 --> 00:00:37.392
+are still recognizable,
 
-00:00:40.717 --> 00:00:43.017
+00:00:37.392 --> 00:00:40.000
+but these bugs may well be corrected
+
+00:00:40.000 --> 00:00:41.671
+in the years to come and it will be
+
+00:00:41.671 --> 00:00:44.000
+increasingly difficult to distinguish them!
+
+00:00:44.000 --> 00:00:45.627
 Want to try again?
 
-00:00:43.134 --> 00:00:45.617
+00:00:45.627 --> 00:00:48.142
 It's up to you!
-
diff --git a/data/tuto3-1/vtt/tuto3-activite1-vid3-en.vtt b/data/tuto3-1/vtt/tuto3-activite1-vid3-en.vtt
index 1b98b2bb0e2053fffe3cc613355219e714cd0d48..2dd26cf1f398fedd1e4f232b69481c8be68d211a 100644
--- a/data/tuto3-1/vtt/tuto3-activite1-vid3-en.vtt
+++ b/data/tuto3-1/vtt/tuto3-activite1-vid3-en.vtt
@@ -1,35 +1,55 @@
 WEBVTT
-Kind: captions
-Language: en-GB
 
-00:00:00.000 --> 00:00:02.120
-This new type of neural network raises many questions
+00:00:04.159 --> 00:00:06.160
+This type of new neural network
 
-00:00:02.120 --> 00:00:08.600
-... as these GANs exist for all media:
-text, music, animated images or videos
+00:00:06.160 --> 00:00:07.603
+raises many questions
 
-00:00:08.600 --> 00:00:10.680
+00:00:07.603 --> 00:00:09.850
+as these GANs exist for all media:
+
+00:00:09.850 --> 00:00:13.509
+text, music, animated images or videos.
+
+00:00:13.509 --> 00:00:16.084
 So, real or fake?
 
-00:00:10.680 --> 00:00:16.700
-It is becoming essential to learn to recognize whether 
-an image is real or machine generated.
+00:00:16.084 --> 00:00:17.930
+It is becoming essential to learn
+
+00:00:17.930 --> 00:00:19.990
+to recognize whether an image is real
+
+00:00:19.990 --> 00:00:21.281
+or machine generated.
+
+00:00:21.281 --> 00:00:22.969
+But how long before the details
 
-00:00:16.700 --> 00:00:22.680
-But how long before the details are no longer visible?
+00:00:22.969 --> 00:00:24.485
+are no longer visible?
 
-00:00:22.680 --> 00:00:28.800
-Are all types of content affected by these generative possibilities?
+00:00:24.485 --> 00:00:26.670
+Are all types of content affected
 
-00:00:28.800 --> 00:00:32.160
+00:00:26.670 --> 00:00:28.629
+by these generative possibilities?
+
+00:00:28.629 --> 00:00:30.648
 Who is the author of these images?
 
-00:00:32.160 --> 00:00:38.880
+00:00:30.648 --> 00:00:32.770
 The person who created the programme?
-The programme that created images that did not exist?
 
-00:00:38.880 --> 00:00:44.840
+00:00:32.770 --> 00:00:34.460
+The programme that created images
+
+00:00:34.460 --> 00:00:35.703
+that did not exist?
+
+00:00:35.703 --> 00:00:37.582
 And if we don't know if it's real,
-is there an annihilation of fiction?
 
+00:00:37.582 --> 00:00:40.309
+is there an annihilation of fiction?