Add Spall Liner toggle to Tankopedia model viewer

packages/i18n/strings/en.json

@@ -527,6 +527,10 @@
               "label": "Edit",
               "reset": "Reset"
             }
+          },
+
+          "spall_liner": {
+            "swap_prompt": "Spall Liner will replace one of your active provisions. Choose which one to remove:"
           }
         },