UTF8 vs ISO8859-1

I have a problem with the UTF8 character.

I explain on the web page there is no problem the visitor see the page with the good character but when I use a spider I see than the robot don’t see the good character, the é, è, à , … are changed in for example for :

détachée I have détachées

If I have write the text in the admin section in iso code but nothing change.

I think that isn’t good to have a good position in search engine, so I would like to solve this issue, thanks for your answer

same… i see also that if you select

english… you get this header…

and french you get

shoudlnt it be iso8859-1 instead of utf8 on french ? lets mod this…