docs: modified guidelines to match transloco

Author: MSakamaki

TRANSLATION.md

@@ -5,34 +5,26 @@
 The following tasks are required to add a new language.
 [See available code here](https://github.com/angular/angular/tree/master/packages/common/locales).
 
-- Copy production into the configurations section of angular.json to create production build settings for the language.
-- Add rewrites for the language to the `rewrites` of `firebase.json`.
-- Add languages ​​to the languages ​​in `xliffmerge.json` (And do `yarn i18n`).
+- Add  word transration file ​​in `src/assets/i18n/[lang-code].json`.
 - Add languages ​​to `langages`, an array of `tools/utils.ts` files.
-- Let's make build environment for language in `build:ssr` in scripts of package.json.
-- Register localeData of the language to be added to `app.module.ts` using `registerLocaleData()`.
-https://angular.io/guide/i18n#i18n-pipes
-- Add a language to the languages propety of `src/app/shared/footer/footer.component.ts`.
+- Register langage code of the language to be added to `translocoConfig()` in `src/app/app.module.ts`.
 - Make a target language directory by copying `en-US` in the content directory. And then run `yarn build-content`.
 
 Hooray! Now you can choose a new language.
 
 ## Do translation
 
-There are two types of translation: translation of the application using angular i18n and translation of the main content composed of markdown.
+There are two types of translation: translation of the application using [transloco](https://netbasal.gitbook.io/transloco/) and translation of the main content composed of markdown.
 
 ### Application translation
 
-Please read the [angular i18n](https://angular.io/guide/i18n) documentation once.
+Please read the [transloco](https://netbasal.gitbook.io/transloco/) documentation once.
 
-Translate the app by editing `src/locale/messages.[language code].xlf`.
-It is difficult to edit xlf file manually, so use something like a tool.
-
-Tool Example: https://poedit.net/
+Translate the app by editing `src/assets/i18n/[lang-code].json`.
 
 ### Translation of content
 
-Translation of content is editing files in the `content/[target lang]` directory.
+Translation of content is editing files in the `content/[lang-code]` directory.
 
 You don't have to make all the files at once. but when it's missing it will be displayed in original English.