feat: Adding support for i18n (closes #462) (#738)

* fix: alt error mix with height/width

More granular detection of alt and resize in image

* fix: format

* feat: init i18n

* feat: add translation

* style: prettier for test

* fix: build-up the locale to fusion with dateLocale

* style: run prettier

* remove cursed file

* refactor: remove i18n library and use locale way instead

* format with prettier

* forgot to remove test

* prevent merging error

* format

* format

* fix: allow string for locale
- Check during translation if valid / existing locale
- Allow to use "en" and "en-US" for example
- Add fallback directly in the function
- Add default key in the function
- Add docstring to cfg.ts

* forgot item translation

* remove unused locale variable

* forgot to remove fr-FR testing

* format

quartz/cfg.ts

@@ -37,8 +37,8 @@ export interface GlobalConfiguration {
   baseUrl?: string
   theme: Theme
   /**
-   * The locale to use for date formatting. Default to "en-US"
    * Allow to translate the date in the language of your choice.
+   * Also used for UI translation (default: en-US)
    * Need to be formated following the IETF language tag format (https://en.wikipedia.org/wiki/IETF_language_tag)
    */
   locale?: string