Remove useless alt attribute on img
WCAG recommends that alt text is empty when an image is for decoration or duplicates information from text.
https://www.w3.org/TR/WCAG20-TECHS/H67.html
This is the case for type icons when the name of the type is next to the icon and menu items. (And this is obvious when you are missing an icon, you get twice the same text which is useless)