Minimize the size of the localization package, use a csproj instead of a nuspec for packing

[nkolev92]

Bug

Fixes: https://github.com/NuGet/Home/issues/11342

Regression? Last working version:

Description

PR Checklist

• [x] PR has a meaningful title

• [x] PR has a linked issue.

• [x] Described changes

• Tests

  • [ ] Automated tests added
  • OR
  • [ ] Test exception
  • OR
  • [x] N/A

• Documentation

  • [ ] Documentation PR or issue filled
  • OR
  • [x] N/A