This is an idea for creating a new feature to engage editors and facilitate collaboration between different languages.

It sometimes happens that an article exists in several languages, and something happens to the real life subject of the article,: For example, when a writer publishes a new book or when a city is chosen to host the Olympics. If people in several languages notice it, it is updated in several languages.

Sometimes people notice these changes and update the article, but it's possible that not all the people in all the languages notice it.

We could do some heuristics to notice that the article underwent changes in many languages and automatically notify people that the article in their language should be notified.

Who and now should be notified? Some ideas:

• The authors of the article that weren't modified (through Notifications)
• The people who made a change in one language, and also made some edits in other languages (through Notifications)
• A message could be left on the unmodified article's talk page

How could it be a problem:

• Too many notifications of this kind in low-activity wikis could create a situation in which a lot of the edits are such notifications, and they are not actually handled
• People who make a lot of technical edits in a lot of wikis without actually knowing their languages could see a lot of unnecessary notifications, so there must be a way to opt out if it.

There could be other shortcomings, but this shouldn't be a reason not consider this feature.