Change the display name of the Title column in a ContentType in Sharepoint 2010

Thanks to AndyZ

You actually need to update three fields -- the title field and the two calculated fields based on it and you need to use the predefined SharePoint ID values. See below or the link above:

You need to add to the FieldRefs by adding the following:

<FieldRef ID="{82642ec8-ef9b-478f-acf9-31f7d45fbc31}" DisplayName="Renamed" Name="LinkTitle" Sealed="TRUE"/>
<FieldRef ID="{bc91a437-52e7-49e1-8c4e-4698904b2b6d}" DisplayName="Renamed" Name="LinkTitleNoMenu" Sealed="TRUE"/>
<FieldRef ID="{fa564e0f-0c70-4ab9-b863-0177e6ddd247}" DisplayName="Renamed" Name="Title" Sealed="TRUE"/>

You need to add to the Fields by adding the following:

<Field ID="{82642ec8-ef9b-478f-acf9-31f7d45fbc31}" DisplayName="Renamed" Name="LinkTitle" Sealed="TRUE" Type="Calculated"/>
<Field ID="{bc91a437-52e7-49e1-8c4e-4698904b2b6d}" DisplayName="Renamed" Name="LinkTitleNoMenu" Sealed="TRUE" Type="Calculated"/>
<Field ID="{fa564e0f-0c70-4ab9-b863-0177e6ddd247}" DisplayName="Renamed" Name="Title" Sealed="TRUE" Type="Text"/>

That should do it. Thanks again to Lambros.