Update category icon

To change the icon on a category, you have to edit the category.
To do so: from the categories list, you have to click on "edit", then on the category you wish to change the icon on.
The enter the "Edit icon" menu and click the 3 dots at the top right corner of the screen.
You can now choose between taking a photo using your device camera, using a photo from your photo library, or searching an icon on google.