Inconsistent use of grey interface elements
The interface uses the colors green, black, grey and orange. The color grey is used for two different meanings and that makes the interface confusing and inconsistent.
The first use is to show that an interface element is disabled and not possible to select or click at the moment. A clear example of this is the button
NEXT when generating a request. The button is grey at first, indicating that it can not be used. When the necessary information has been filled in, the button changes color to green, making it obvious that now the button is enabled and can be used to advance to the next page.
This is a good use of grey. It builds on the conventional use of grey in other interfaces, like menu items in a drop-down menu, in many operating systems.
The other use of grey on the web site is shown in the list of available languages to use for a request. In this case grey means that an interface element is not selected. Despite the grey color it is enabled and available, but not yet selected. Once it is selected the color changes.
When the user see the list of greyed-out languages they think none of them are available. It would be better and more intuitive if all the available choices where black.