New Crowdin updates (#554)

* New translations app_en.arb (Greek)

* New translations app_en.arb (Persian)

* New translations app_en.arb (Spanish)

lib/l10n/es_ES/app_es_ES.arb

@@ -970,9 +970,9 @@
   "@translate": {},
   "translateHelp": "Ayuda a traducir la aplicación InvenTree",
   "@translateHelp": {},
-  "unavailable": "Unavailable",
+  "unavailable": "No disponible",
   "@unavailable": {},
-  "unavailableDetail": "Item is not available",
+  "unavailableDetail": "Artículo no disponible",
   "@unavailableDetail": {},
   "unitPrice": "Precio Unitario",
   "@unitPrice": {},