chore: update newsfeed.js (#3692)

Therefor -> Therefore

refs: #3690

modules/default/newsfeed/newsfeed.js

@@ -57,7 +57,7 @@ Module.register("newsfeed", {
 	// Define required translations.
 	getTranslations () {
 		// The translations for the default modules are defined in the core translation files.
-		// Therefor we can just return false. Otherwise we should have returned a dictionary.
+		// Therefore we can just return false. Otherwise we should have returned a dictionary.
 		// If you're trying to build your own module including translations, check out the documentation.
 		return false;
 	},