Does anyone has a useful mailing list for this, or another source where I can reach Wikipedia contributors?
The main Wikipedia list is at http://lists.wikimedia.org/mailman/listinfo/wikipedia-l
There are specific lists for various languages, such as wikien-l for English. http://lists.wikimedia.org/mailman/listinfo/wikien-l
Each language version of Wikipedia also has a "village pump" discussion area. These are linked in the interlanguage links area of http://en.wikipedia.org/wiki/Wikipedia:Village_pump
Angela