CONTRIBUTING, README: add link to https://lukwebsforge.github.io/tldri18n (#5378)

CONTRIBUTING.md

@@ -94,6 +94,8 @@ Language specific directories must follow the pattern `pages.<locale>`, where `<
 
 The `<country>` code is optional and should only be added when it is needed. In other words, only when there is a valid reason to distinguish between a language (`ll`) and its regional dialects (`ll_CC1`, `ll_CC2`, etc.). As an example, both `fr_FR` and `fr_BE` should fall under the same `pages.fr` directory, since there virtually is no difference in writing between standard French and Belgian French.
 
+To see the current progress of all translations, you can visit <https://lukwebsforge.github.io/tldri18n/>, which provides a dynamically updated table of all pages and their translations.
+
 Some examples of valid locale tags:
 
  - French: `fr`.

README.md

@@ -163,6 +163,9 @@ All contributions are welcome!
 We strive to maintain a [welcoming and collaborative](GOVERNANCE.md) community.
 Have a look at the [contributing guidelines](CONTRIBUTING.md), and go ahead!
 
+If you'd like to contribute to translations, you can visit <https://lukwebsforge.github.io/tldri18n/>
+to see the current progress of all translations.
+
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