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/stock/models.py

@@ -78,6 +78,13 @@ class StockLocation(MetadataMixin, InvenTreeTree):
         """Return API url."""
         return reverse('api-location-list')
 
+    icon = models.CharField(
+        blank=True,
+        max_length=100,
+        verbose_name=_("Icon"),
+        help_text=_("Icon (optional)")
+    )
+
     owner = models.ForeignKey(Owner, on_delete=models.SET_NULL, blank=True, null=True,
                               verbose_name=_('Owner'),
                               help_text=_('Select Owner'),