When attempting to enable Multilingual app toolkit on a project, nothing happens
For a .Net Standard project, edit the csproj file to add:
<PropertyGroup>
<TargetFramework>netstandard2.0</TargetFramework>
<NeutralLanguage>en-US</NeutralLanguage>
</PropertyGroup>
Add a line like this to your assemblyinfo.cs file:
[assembly: NeutralResourcesLanguage("en")]
The indicated language is the one that the application currently uses (i.e usually hardcoded texts, before translation)