User profile default editor to use is misleading

When no specific default editor to use is set in the user profile (i.e. "----" option is selected), the user profile displays a text like "Wysiwyg (Default)" or "Text (default)", when accessing the user profile. This value is computed based on the configuration of the wiki where the user profile is actually stored. This can be misleading if the user performs editions on several subwikis since the subwikis might have other configuration set, and the user might not pay attention that the value is computed: seeing Wysiwyg they'll think their editor is Wysiwyg for all wikis.

IMO we should not display the computed value, but instead we should display a text such as "Editor configured in the wiki". Another solution on the long run would be to allow seeing the user profile in the context of each wiki.