[color:"orange"]- Previous random items still in english, it's not a problem.[/color]

Random item stats are saved in the items.000 file in the saved game folder. This file can not be replaced without corrupting all equipment with random stats.


[color:"orange"]- The Learning skills descriptions in english[/color]

The skill section of the data.000 file in the save folder contains descriptions. It may be possible to replace that whole section of the file with the corresponding section from a French save.


[color:"orange"]- I don't have any character traits now.[/color]
...
[color:"orange"]That's strange because they change and have changed since I use the french version.[/color]

Do you mean there were no traits originally listed, but they did get start to be updated? It is possible there are format differences between the French and English versions of the game, and the French game didn't understand the English listing, so displayed nothing until it overwrote that data when updating the trait descriptions.