For each identity an autocorrection language can be set (Settings->Identities->Modifie->Advanced). But in composer window, when editing a message, the default autocorrection (spelling) language is American English (the desktop envinronment language setting). Reproducible: Always Expected Results: the default autocorrection (spelling) language should be the language of the identity, as set in Settings->Identities->Modifie->Advanced
spelling and autocorrection is two differents settings.
My wrong settings :( sry