Hello. After reading your project description, I think I can develop quickly a website to match your needs.
I recommend using wordpress as base, since it already handles most post creation and taxonomy relations, which will fasten up the development.
Over that I would build a custom theme to exactly match the site you want to mimic. Depending on the site, this could be accomplished in 15-20hs.
The template will be developed having in mind that translations will be needed. Once the template is finished, we will implement a plugin that allows you to handle translations of posts, contents, category names, etc. You can also handle the available languages. This means that once you have this system working, you won't ever need another coder to add a new language. This process should take no more than 5hs.
The next step is to integrate with subscriptions. We need to discuss a little bit more about how you want this implemented, but in general lines this should take no more than 10hs. It will probably be less.
After that we will implement the "related posts" feature, and some other cool tune ups to allow you to have nice usage metrics, and some tools to make administration of the site even easier. This process will take 10hs.
The total project duration would be 40-45hs. I can offer you to work 20hs a week, so we are talking about 2 weeks to have this project finished.
Looking forward to work with you.
Best Regards,
Sebastian Choren