Administration categories are badly displayed when they contain a long description

When administration categories have a long description (which can occur in different languages), parts of the descriptions are displayed under the category image.

One fix would be to allow bigger description fields here : https://github.com/xwiki/xwiki-platform/blob/fe4a21cdaebca91f8620aa0cdf2722dd1c30cee0/xwiki-platform-core/xwiki-platform-administration/xwiki-platform-administration-ui/src/main/resources/XWiki/AdminSheet.xml#L888