append logo at ´Username´-Menu as there is a logo on password too

The one on the password has a function (shows the password). It would be confusing to add one to the username that doesnt do anything

agree. The icon in username is superfluous.

About the ordering of the "forgot .." links: It is a common order in all login sites i know, probably because users forget their password more often than their username.

Looking at it a little more closely I can see why the module has an icon. It is the only thing in the module to indicate visually that the first field is for a username.
The component has a visible label

Don't forget login module has an option for showing labels instead of icons.

I wonder if password toggler should be shown here regardless of the option since it's not just an icon. Maybe the option should be removed? There was already a PR for that.