chore(i18n): refactor and cleanup (#805)

* checkpoint

* finish

* docs

quartz/components/pages/FolderContent.tsx

@@ -5,9 +5,8 @@ import style from "../styles/listPage.scss"
 import { PageList } from "../PageList"
 import { _stripSlashes, simplifySlug } from "../../util/path"
 import { Root } from "hast"
-import { pluralize } from "../../util/lang"
 import { htmlToJsx } from "../../util/jsx"
-import { i18n } from "../../i18n/i18next"
+import { i18n } from "../../i18n"
 
 interface FolderContentOptions {
   /**
@@ -54,8 +53,9 @@ export default ((opts?: Partial<FolderContentOptions>) => {
         <div class="page-listing">
           {options.showFolderCount && (
             <p>
-              {pluralize(allPagesInFolder.length, i18n(cfg.locale, "common.item"))}{" "}
-              {i18n(cfg.locale, "folderContent.underThisFolder")}.
+              {i18n(cfg.locale).pages.folderContent.itemsUnderFolder({
+                count: allPagesInFolder.length,
+              })}
             </p>
           )}
           <div>