Use opacity instead of grey colour on pending items

src/components/CrudDocument/style.scss

@@ -2,7 +2,7 @@
 
 .crud-document-wrapper {
     &.pending {
-        color: $color-grey-md;
+        opacity: $opacity-pending;
     }
 }
 

src/sass/variables.scss

@@ -1,2 +1,4 @@
 $color-grey-md: #999;
 
+$opacity-pending: 0.4;
+