On Mon, 22 Jul 2013, Ken Sharp wrote:
Logon/Log on as with the British/neutral patch.
msgid "Can't logon with inter-domain trust account.\n" -msgstr "Can't logon with inter-domain trust account.\n" +msgstr "Can't log on with inter-domain trust account.\n"
[...]
I think these fixes should really be applied to the source winerror.mc file instead. If I remember correctly en_US.po is just a dummy translation where msgid and msgstr strings should be identical (there might (with maybe one or two exceptions for things like um -> µm).