How to set up content writers to produce articles in their own languages
I manage multilanguage sites with lingotek module, but it can be with other modules,to prevent a user to upload a node in a wrong language, with rules module add a rule, event: Drupal is initializing, condition: compare user language with current language, action: page redirect, change language or whatever to prevent it to be in wrong language. once uploaded you can translat it. with lingotek configure your contentype to be auto-translated when uploaded.