fix(aria-valid-attr-value): fix incomplete translation message (#1739)

Author: straker

lib/checks/aria/valid-attr-value.json

@@ -7,7 +7,7 @@
 		"messages": {
 			"pass": "ARIA attribute values are valid",
 			"fail": "Invalid ARIA attribute value{{=it.data && it.data.length > 1 ? 's' : ''}}:{{~it.data:value}} {{=value}}{{~}}",
-			"incomplete": "ARIA attribute{=it.data && it.data.length > 1 ? 's' : ''}} element ID does not exist on the page:{{~it.data:value}} {{=value}}{{~}}"
+			"incomplete": "ARIA attribute{{=it.data && it.data.length > 1 ? 's' : ''}} element ID does not exist on the page:{{~it.data:value}} {{=value}}{{~}}"
 		}
 	}
 }