Fix i18n guide link, fix need(s) updating plural (withastro#1322)

* Fix i18n guide link, fix `need(s) updating` plural

* Actually fix plural form (this was a test!)

scripts/github-translation-status.mjs

@@ -94,7 +94,7 @@ class GitHubTranslationStatus {
 			should not be translated at this point. We will add more pages to these lists soon.
 
 			Before starting, please read our
-			[i18n guide](https://github.com/withastro/docs/tree/main/src/i18n/README.md) to learn about
+			[i18n guide](https://github.com/withastro/docs/blob/main/TRANSLATING.md) to learn about
 			our translation process and how you can get involved.
 		`;
 		let humanFriendlySummary = dedent`
@@ -375,7 +375,7 @@ class GitHubTranslationStatus {
 			lines.push(
 				`<summary><strong>` +
 				`${this.languageLabels[lang]} (${lang}): ` +
-				`${missing.length} missing, ${outdated.length} needs updating` +
+				`${missing.length} missing, ${outdated.length} need${outdated.length === 1 ? 's' : ''} updating` +
 				`</strong></summary>`
 			);
 			lines.push(``);