Multilevel folder (URL) structure

[Carlos]

Several pages cannot have the same slug (the "news_title_here" part).

While it's not what you want, an easy way to do a multilingual site could be adding a prefix (or suffix) to non-English page slugs, like:

domain.com/news/news_title_here/
domain.com/news/de-news_title_here/
domain.com/news/fr-news_title_here/
...
(or .../news_title_here-de/ , etc. if you prefer a suffix)

PS Not sure, but maybe something could be done with mod_rewrite...