A gnu.org translation team leader is the person who is ultimately responsible for organizing and managing the team, including, but not limited to, having the final say on contributed translations and exercising levels of control as she sees fit.
A prospective team co-ordinator should have perfect understanding of the GNU Philosophy and the various issues the free software movement set out to solve. Energy and time are always needed, as well as certain communication skills.
However, a team leader is not a dictator (for life); every action and decision taken should have its justification and should stem from the goals of the project at large. Inefficient or inoperative leaders are replaced, if necessary.