Change Windows Live to Microsoft account
The Windows Live brand has been long discontinued. You can find a list of what Windows Live services were renamed to here.
I believe the replacement word should be 'Microsoft account'. Please update the icon on the login page and the following strings to reflect this change: https://translatewiki.net/wiki/Osm:User.login.auth_providers.windowslive.title/en and https://translatewiki.net/wiki/Osm:User.login.auth_providers.windowslive.alt/en