Wordpress Thumbnail + Gallery (Wordpress)

Hello,

I need a wordpress plugin that works with my website (locationcergy.fr). My website is based on wordpress but has had ma,y modifications done.

What i need is a very simple plugin that:

- On authors control panel (post-new.php page), there needs to be an additional box, where user can upload an image or choose from HIS WP media images and visualize the images they have chosen on the page as thumbnails. Max 5 images. Author must be able to choose ONE thumbnail for his article.

Please note this must be sperate from the text part.
Therefore the button for uploading a picture must be removed.

Also the pictures uploaded should be linked to the media section (WP image gallery). So if you upload an image on post-new.php page, they should also appear on the users WP image gallery (upload.php).

Please note that I have used a plugin so that authors can only see their pictures in the upload.php section.


- How should the images be visible?

The thumbnail should be 150x150 and should be seen on the index page for each article (aligned left with the text, as can be seen now on the website). The other pictures attached to the article should not be visible on index page.

On the article page, i want something like this:
http://www.pap.fr/annonces/annonce-immobiliere-paris-pap-712543.htm
where all thumbnails are at the top of the article, and when you click on one you can see it in bigger underneath.

Also i need a language file, so that i can translate what is done in french.