According to a post from a user on this question:
ILMerge and localized resource assemblies
You can use dotfuscator to do this. I'd like to, because I'm having issues with ILmerge. But when I try to add all my resource.dlls for localization and combine them with my exe, I get the following error:
An assembly appears more than once in the input list. This version of Dotfuscator does not support side by side versioned assemblies as inputs. (Gatherer.resources.dll)
Build Error.
I contacted dotfuscator support and their technician said the developer was incorrect and it does not support that functionality.