The top editor sometimes has the title executive editor or editor-in-chief (the former is replacing the latter in the language). This person is generally responsible for the content of the publication. [The exception is that newspapers that are large enough usually have a separate editor for the editorials and opinion pages.]
The executive editor sets the publication standards for performance, and is responsible for assuring the highest standards of ethical conduct in the process of gathering and presenting information, as well as for motivating and developing the staff. The executive editor is also responsible for developing and maintaining the publication budget. In concert with the publisher and the operating committee, the executive editor is responsible for strategic and operational planning.
This about sums it up, actually.
But other suggestions I've had are (in random order): Chief Supervising Editor, Editing Chief, Supervising Editor, Senior Editor, Editing Consultant, Senior Editing Consultant, Managing Editor, Publishing Editor, Editor-in-chief, Chief Editor, Principal Editor, "Chief editor, translations".
Most votes so far on Editor-in-chief. Someone also said "less is more". Maybe simply Editor will do? Wouldn't an Editor-in-chief be in a newspaper or magazine?