NeutralResourcesLanguage Usage

This attribute (not a setting) can be defined in project properties, like so

1. In Solution Explorer, right-click your project, and then Click Properties.
2. From the left navigation bar select Application, and then click Assembly Information.
3. In the Assembly Information dialog box, select the language from the Neutral Language drop-down list.
4. Click OK.

In .Net core projects you can specify it in csproj:

<PropertyGroup>
  <TargetFramework>netcoreapp3.0</TargetFramework>
  <NeutralLanguage>fr</NeutralLanguage>
</PropertyGroup>

or using Visual studio:

1. In Solution Explorer, right-click your project, and then Click Properties.
2. From the left navigation bar select Package
3. Select value for Assembly neutral language