The easiest way is to persist the images in ResX files (typically encoded in base64 - just set a BackgroundImage for a control and look at the form's/user control's .resx file "under" the file is you show all files in your project for an example). This allows you to use the ResourceManager which already takes care of the satellite assemblies for you; otherwise, you can use Assembly.GetSatelliteAssembly (calling it on an Assembly reference that is the primary assembly using the same assembly name but a different culture) and then call GetManifestResourceStream from that. If your primary assembly (the one with IL modules in it - the code that is executing) contains that culture (if you use the assembly-level NeutralResourcesLanguageAttribute) or if no satellite assembly is found, and exception will be thrown so then grab the resource out of the primary assembly.
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