Peter,

 

Please use Gallery.Culture Property to specify the culture for dotnetgallery.

For example:

<CE:Gallery
    id="gallery1"
    runat="server"
    Height="500"
    Width="600"
    Column = "8"
    Culture="fr-FR"
    MaxImageWidth="1024"
    BackColor="#ffffff"
    CellPadding="5"  
    AutoResizeUploadedImages = "true"  
    CellSpacing="5"
    ForeColor="#000000"
    BorderColor="#cc0000"
    BorderStyle="solid"
    BorderWidth="0"
    CssClass="container"
    ShowUpload="true"
    ShowEditDescription="true"
    ShowThumbNailName="true" 
    ShowThumbNailSize="true" 
    ShowThumbNailDate="false" 
    ShowThumbNailDescription="true" 
    FolderPath = "~/samplefolder"
    ></CE:Gallery>