Hi,
You have to download the source code from here : https://wpftoolkit.codeplex.com/SourceControl/latest.
Open the sln and find the appropriate xaml file as pointed before.
Then Search "ToolTip="Show View Finder""
and translate it.
Re-compile.
Reference the newly compiled Xceed.Wpf.Toolkit.dll and you will have the translated text.
You have to download the source code from here : https://wpftoolkit.codeplex.com/SourceControl/latest.
Open the sln and find the appropriate xaml file as pointed before.
Then Search "ToolTip="Show View Finder""
and translate it.
Re-compile.
Reference the newly compiled Xceed.Wpf.Toolkit.dll and you will have the translated text.