If I insert rows, the addition cells are turning red. also when I print out the lists on a laser printer, they are hard to read due to the grays, reds and greens on the sheet. 
Yes, it's for prevent you that some of calcul may not work after this modifs. It's better to write after the last line and sort at the end.
I had stop to put nationality in the drop down bax after too many colony wish to add their names! 

 I go to languages with the last versions and if you want a sheet with Maori or Rapa nui  

 I happilly send you a version for a translation of the different term.
Olivier - the worksheet with the calculations (donnees) is now visible and selectable (it's been hidden up to now). Not a problem, but is this your intention? 
No  
 
  
  I was too tired yesterday evening when I send the las version.