unwanted culture specific dlls copied to bin directory

My solution was to add this target at the end of the .csproj file before the closing project tag.

<Target Name="AfterPackage" AfterTargets="CopyAllFilesToSingleFolderForPackage" />

<ItemGroup>
    <FluentValidationExcludedCultures Include="cs;da;de;es;fa;fi;fr;it;ko;mk;nl;pl;pt;ru;sv;tr;zh-CN">
        <InProject>false</InProject>
    </FluentValidationExcludedCultures>
</ItemGroup>

<Target Name="RemoveTranslationsAfterBuild" AfterTargets="AfterBuild">
    <RemoveDir Directories="@(FluentValidationExcludedCultures->'$(OutputPath)%(Filename)')" />
</Target>

<Target Name="RemoveTranslationsAfterPackage" AfterTargets="AfterPackage">
    <RemoveDir Directories="@(FluentValidationExcludedCultures->'$(_PackageTempDir)\$(OutputPath)%(Filename)')" />
</Target>

It's not pretty, but it gets the job done. If you need some culture specific resource, just remove the corresponding line from the list. If a future update adds a new culture that you don't want, add it to the list.

The best option would be ask the developer to separate the resources in multiple nugets, this way you could just add the ones needed. I'll stick with this solution, for now, until someone come up with a better one.

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Now you can find my solution at the official project wiki: https://github.com/JeremySkinner/FluentValidation/wiki/f.-Localization (at the bottom of the page)