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

* checkpoint

* finish

* docs

quartz/i18n/locales/definition.ts

@@ -0,0 +1,63 @@
+import { FullSlug } from "../../util/path"
+
+export interface Translation {
+  propertyDefaults: {
+    title: string
+    description: string
+  }
+  components: {
+    backlinks: {
+      title: string
+      noBacklinksFound: string
+    }
+    themeToggle: {
+      lightMode: string
+      darkMode: string
+    }
+    explorer: {
+      title: string
+    }
+    footer: {
+      createdWith: string
+    }
+    graph: {
+      title: string
+    }
+    recentNotes: {
+      title: string
+      seeRemainingMore: (variables: { remaining: number }) => string
+    }
+    transcludes: {
+      transcludeOf: (variables: { targetSlug: FullSlug }) => string
+      linkToOriginal: string
+    }
+    search: {
+      title: string
+      searchBarPlaceholder: string
+    }
+    tableOfContents: {
+      title: string
+    }
+  }
+  pages: {
+    rss: {
+      recentNotes: string
+      lastFewNotes: (variables: { count: number }) => string
+    }
+    error: {
+      title: string
+      notFound: string
+    }
+    folderContent: {
+      folder: string
+      itemsUnderFolder: (variables: { count: number }) => string
+    }
+    tagContent: {
+      tag: string
+      tagIndex: string
+      itemsUnderTag: (variables: { count: number }) => string
+      showingFirst: (variables: { count: number }) => string
+      totalTags: (variables: { count: number }) => string
+    }
+  }
+}