One strategy, which would require some coordination with the Sandcastle XSLT files, would be to use the xml:lang attribute on your XML documentation. Visual Studio 2010 allows multiple tags to remain (although you may get complaints about duplicate tags).
/// <summary>
/// Gets or sets the fill size of the load operation.
/// </summary>
/// <summary xml:lang="fr">
/// Obtient ou définit la taille de remplissage de l'opération de chargement.
/// </summary>
public int FillSize
{
get;
set;
}
Resulting output:
<member name="P:Namespace.MyAttribute.FillSize">
<summary>
Gets or sets the fill size of the load operation.
</summary>
<summary xml:lang="fr">
Obtient ou définit la taille de remplissage de l'opération de chargement.
</summary>
</member>