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For those new to this software it would be good to include a simple overview of the process on the home page. I suggest something like this:
1. Make a file containing PlantUML commands, either with an editor or when running other software which calls PlantUML.
2. Run (or have the software call) PlantUML with this file as input. The output is an image, which either appears in the other software, or is written to an image file on disk.
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On the "Running Page" the phrase "To launch diagram's images generation..." is confusing English. You could say something like, "To get PlantUML to make an image of your diagram..."
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On the "Running Page", the number of links is overwhelming. it would be good to make a new section (above the others) named something like "Quickstart to test PlantUML on your system" containing:
Linux
which will have links to information contained in
http://plantuml.com/faqinstall.html
http://plantuml.com/gui.html
Windows
which will have the appropriate links
etc.
I say this because I had to do a lot of searching and digging to find out how to test it on my Linux system.
Thank you