SessionStore migration (#15002)

* Finished

* Fiximports

* Fix i18n

app/oauth.go

@@ -450,7 +450,7 @@ func (a *App) RegenerateOAuthAppSecret(app *model.OAuthApp) (*model.OAuthApp, *m
 func (a *App) RevokeAccessToken(token string) *model.AppError {
 	session, _ := a.GetSession(token)
 
-	schan := make(chan *model.AppError, 1)
+	schan := make(chan error, 1)
 	go func() {
 		schan <- a.Srv().Store.Session().Remove(token)
 		close(schan)