Add missing NL spellcheck

Author: jerone

.cspell.json

@@ -3,13 +3,15 @@
 	"version": "0.2",
 	// language - current active spelling language
 	"language": "en,nl",
+	"import": ["@cspell/dict-nl-nl/cspell-ext.json"],
 	// words - list of words to be always considered correct
 	"words": [
 		"absmiddle",
 		"ajax",
 		"blockquotes",
 		"darkred",
 		"datetime",
+		"GM_xmlhttpRequest",
 		"greasemonkey",
 		"jerone",
 		"maxlength",

package-lock.json

@@ -9,6 +9,7 @@
 		"lint:fix": "prettier --write \"**/*\" & eslint -f checklist --fix ."
 	},
 	"devDependencies": {
+		"@cspell/dict-nl-nl": "^2.3.0",
 		"@cspell/eslint-plugin": "^8.3.2",
 		"eslint": "^8.56.0",
 		"eslint-config-prettier": "^9.1.0",