Feature/icons for PartCategory and StockLocation (#3542)

* Added icon to stock location

- added `icon` field to `stock_stocklocation` model
- added input field to stock location form
- added icon to breadcrumb treeview in header
- added icon to sub-locations table
- added icon to location detail information
- added `STOCK_LOCATION_DEFAULT_ICON` setting as default

* Added icon to part category

- added `icon` field to `part_partcategory` model
- added input field to part category form
- added icon to breadcrumb treeview in header
- added icon to sub-categories table
- added icon to category detail information
- added `PART_CATEGORY_DEFAULT_ICON` setting as default

* Added `blocktrans` to allowed tags in ci check

* fix: style

* Added `endblocktrans` to allowed tags in ci check

* fix: missing `,` in ci check allowed tags script

* Removed blocktrans from js and fixed style

InvenTree/part/serializers.py

@@ -75,6 +75,7 @@ class CategorySerializer(InvenTreeModelSerializer):
             'pathstring',
             'starred',
             'url',
+            'icon',
         ]
 
 
@@ -88,6 +89,7 @@ class CategoryTree(InvenTreeModelSerializer):
             'pk',
             'name',
             'parent',
+            'icon',
         ]