Finally, I found some time to continue with work on the project Mass content adding (http://meta.wikimedia.org/wiki/Mass_content_adding). I started with preparing materials for adding countries (http://meta.wikimedia.org/wiki/Countries_of_the_world and http://meta.wikimedia.org/wiki/Countries_of_the_world/Names_of_the_countries) and I found a number of open questions of multilingual/cross-Wikipedia cooperation.
As I want to have the base for countries related things -- on English Wikipedia -- the first point on the road of getting some help was the WikiProject Countries (http://en.wikipedia.org/wiki/Wikipedia:WikiProject_Countries) on English Wikipedia. I wrote a message to the participants of the project and I am waiting for their response...
And, here is the point: It is very useful for me that some other projects can cover some parts of the project Mass content adding. But, this is the project of English Wikipedia, not a multilingual project. And I am sure that some people from other Wikipedias would be interested to participate in the project Mass content adding. Also, for the MCA project, there is a need for coordination between a number of Wikipedian communities. And there is no such thing as "Coordination place for WikiProjects Countries". And this is just one example of need for cross-Wikipedia coordination/cooperation.
So, I think that all of such projects should have some place on Meta for multilingual coordination. This means, also, that there people from different Wikipedias should announce the existance of new project on some page on Meta.
I would like to see a unified template for countries on all of Wikipedias; a unified template for biographies on all of Wikipedias; etc. In general, smaller Wikipedias are copying English templates, but there are no feed-backs.
I remember: when I asked people on Serbian Wikipedia would we want to use a template from English Wikipedia, one of them said "Why to use their, our is better?" And, in deed, in that time Infobox Country on Serbian Wikipedia was based on Infobox Country on English Wikipedia, but with some more features.
In other words, I think that a number of technical details on Wikipedia should be multilingual and not specific for the local Wikipedias.