If you think a page in Moodle Docs needs reformulating/rewriting, you can either edit the page directly, or add your suggested changes to the corresponding talk page (via the "page comments" tab). Anyone watching the page will receive email notification of page changes. It's unusual for it to be necessary to roll back/revert a page to a previous version.
Regarding documentation in other languages, whilst an English version will always be appreciated, it's not actually required. It's impossible to maintain Moodle Docs in other languages as exact translations of the English Moodle Docs, however the use of inter-language linking enables quick access between corresponding pages in different languages.
For further information, please see the guidelines for contributors and the documentation philosophy.