I wonder if there are gorgeous mods, which are unknown to the english speaking community, [...]
If you just want to check out pretty screenshots, there are a few large French WIP mods with some
very interesting screenshots.
First, you have "l'Archipel de Pertevue", as its French name suggests it adds an archipelago off the coast of Vvardenfell. It's been a wip for a very long time, but is still being worked on by a small team of dedicated modders. The mod will feature many new meshes (including new architecture, npc animations...), you can find some screenshots http://forum.wiwiland.net/index.php?/topic/26431-mod-complet-larchipel-de-pertevue/page__view__findpost__p__641471. There's also a map of the archipelago http://www.hostingpics.net/viewer.php?id=246487Taille_Pertevue.jpg. Last but not least, I encourage you to check out the http://www.dailymotion.com/OraNN, they are really, really cool and showcase some of the new animated meshes created for the project.
You also have the Stargate mod, it's actually been released in French already, here is a link to screenshots, videos etc:
http://www.moddb.com/mods/morrowind-stargate
Another mod with nice vids to check out is http://forum.wiwiland.net/index.php?/topic/27401-guilde-des-inventeurs-chapitre-2/ It's a new faction, if you have the time you really should browse through the wip thread, its in French but the screenshots are really nice! If you don't have the time though, you should at least have a look at http://www.dailymotion.com/Von_Zeeple, you will see a new weapon added by the mod as well as traps and some cars (!), among other things.
Here you go, have a nice time checking the mods out ^_^ There are a few others, but I dont have the time to write something about them and dig up links to videos and screenshots, maybe later if theres some interest.