The reason why Merit circulation in English boards is more is because there are more people in these boards. But I believe local boards have their Merit Sources too, who are constantly meriting posts that are worthy. And those boards with more population and much better posting qualities would probably have more Merits in circulation, i.e English boards.
No learning all languages is not possible but like facebook there is a translator app that allows post to be translated I know this is a very difficult addition but it can be achieved first by spreading the needs for great post to be understood and every one can learn
What exactly are you proposing? Are you suggesting that we all learn the languages of the world, specifically to search for more posts to merit?
Now I'm curious to know if to which board you belong, because what you did here can be a reason why your board lack Merits in circulation.