Ok guys, finally! my problem was solved
1) Open AssemblyInfo.cs file of ManyWpfControlLibrary.csproj .
2) Add following attribute to this file
[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.MainAssembly)]
3) Build this project to get new assembly with the attribute.
4) Create *.zip from this new assembly
5) Delete older DependancyAssemblies.zip from WpfUserControlFactory.csproj
6) Add newly created zip in step 4 as embedded resource in WpfUserControlFactory.csproj.