Robots 
Author: Marius T.
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robots.txt generated by X5 does block some inside resources, like it should be. Otherwise I can see a full discution about it according to the links below.
Should we edit the robots.txt or not?
Refferer:
https://webmasters.googleblog.com/2015/03/unblocking-resources-with-webmaster.html
Posted on the
Disallow: /image
Hello Marius,
These resources are not required to be indexed since these are the background settings of the menu buttons.
It won't help to have a better ranking since it's not a content which needs to be indexed but if you want to can remove the line:
disallow /menu
Many thanks!
Author
Thank you too, it seems reasonable what you just said, I am a little foggy about the Google article because there is no reason indeed to index the backgound menu / CSS and so on.