Improve schema and update tags

- Make constants in schema explicit
- Enumerate tag-categories
- More i18n utilities
- Better anonymous user support without special field
- Remove most tuples and unchecked type-casting

src/pages/feed.xml.ts

@@ -49,7 +49,7 @@ export const GET: APIRoute = async ({ site }) => {
           pubDate: toNoonUTCDate(data.pubDate!),
           link: `/stories/${slug}`,
           description:
-            `${t(data.lang, "story/warnings", data.wordCount || "???", data.contentWarning.trim())}\n\n${markdownToPlaintext(data.description)}`
+            `${t(data.lang, "story/warnings", data.wordCount, data.contentWarning.trim())}\n\n${markdownToPlaintext(data.description)}`
               .replaceAll(/[\n ]+/g, " ")
               .trim(),
           categories: ["story"],