Thank you propbeanie for your patience and your advice,
I will follow all your advice in your pdf.
I uninstall the Rub1.45 mod as well as the tripartite translation and I tried the mission editor again and Oh miracle, the mentions GENERIC Destroyers and GENERIC all types of warship appear!
So there is a "rubbish" file in the Rub 1.45 mod or translation that has changed the configuration.
The problem is surrounded
I also take the opportunity to thank all the people who helped me to discover this wonderful game.
Best regards
Yves