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

* checkpoint

* finish

* docs

quartz/plugins/transformers/frontmatter.ts

@@ -5,6 +5,7 @@ import yaml from "js-yaml"
 import toml from "toml"
 import { slugTag } from "../../util/path"
 import { QuartzPluginData } from "../vfile"
+import { i18n } from "../../i18n"
 
 export interface Options {
   delims: string | string[]
@@ -43,7 +44,7 @@ export const FrontMatter: QuartzTransformerPlugin<Partial<Options> | undefined>
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "FrontMatter",
-    markdownPlugins() {
+    markdownPlugins({ cfg }) {
       return [
         [remarkFrontmatter, ["yaml", "toml"]],
         () => {
@@ -59,7 +60,7 @@ export const FrontMatter: QuartzTransformerPlugin<Partial<Options> | undefined>
             if (data.title) {
               data.title = data.title.toString()
             } else if (data.title === null || data.title === undefined) {
-              data.title = file.stem ?? "Untitled"
+              data.title = file.stem ?? i18n(cfg.configuration.locale).propertyDefaults.title
             }
 
             const tags = coerceToArray(coalesceAliases(data, ["tags", "tag"]))