replace and remove add

resources/frontend_client/app/components/icons/add.html

-<svg id="add" viewBox="0 0 32 32" fill="currentcolor" ng-attr-width="{{width}}" ng-attr-height="{{height}}">
-    <path d="M19,13 L19,2 L14,2 L14,13 L2,13 L2,18 L14,18 L14,30 L19,30 L19,18 L30,18 L30,13 L19,13 Z"></path>
-</svg>

resources/frontend_client/app/explore/partials/data_grid.html

@@ -40,7 +40,7 @@
             <!-- add filter button/dropdown -->
             <div class="Dropdown inline-block" dropdown is-open="filtersOpen">
                 <a class="Pill link mr1" href="#" dropdown-toggle ng-click="toggleNewFilters()">
-                    <cv-add-icon width="12px" height="12px"></cv-add-icon>
+                    <mb-icon name="add" width="12px" height="12px"></mb-icon>
                     Filter
                 </a>
                 <div class="Dropdown-content" ng-click="handleDropdownInput($event)">