LPS-35976 Rename the "My Account" portlet as "Account Settings"

This is a change validated by UX and PM. The term "My Account" is preserved as the UI that groups all personal portlets, including "Account Settings" but also "My Pages" and others.
LPS-35976 The title of the pop-up should be "My Account" without the verb "manage"
LPS-35976 Displaying a header with the name of the user within My Account/Account Settings is redundant
LPS-35976 SF
LPS-35976 Update older keys as well