Created Resource files for ProtoAssociative and ProtoImperative

@Benglin  @ke-yu  I created resource files for these 2 projects and renamed the StringConstants.cs to StringConstantsOLD.cs. Please take a look.
I think `resx` file should not be included, can you try deleting and make sure? Also try `Designer.cs` file, see if you can delete it and have it regenerated.