HI Yannick,
The row and column reference tabs appear when the Formula Editor is open. Click on an empty cell, then type an = sign. Numbers will interpret that as the beginning of a formula, and will open the Formula Editor and show the reference tabs with row numbers and column letters. Double clicking a cell that already contains a formula will also open the editor and show the tabs.
ROW() accepts only a single argument, which must be a cell address (or a formula or function that returns a cell address. ROW does not require an argument.If none is given, ROW assumes the cell it occupies to be the target cell and returns its row number.
In the iWork Formulas and Functions User Guide (English version), ROW is listed in Chapter 9, Reference functions. ROW and COLUMN are the only functions in that section/chapter which take only an optional single cell addres argument, so the French name for ROW shouldn't be very difficult to dig out. Be aware that two other functions, ROWS and COLUMNS are also included in this chapter. These also take a single argument, but the argument is a range of cells, and the functions return a count of the number of ROWS or COLUMNS in that range.
Regards,
Barry