Reword error when user cannot create a project due to project creation limits

The following discussions from !91610 (merged) should be addressed:

• @eduardosanz started a discussion: (+3 comments)

  Change the text of these errors org/gitlab/-/blob/f9ddd3f1/app/models/project.rb#L1370

  • From: 'Personal project creation is not allowed. Please contact your administrator with questions'
  • To: 'you aren't allowed to create personal projects. Contact your GitLab administrator.'
  • From: 'Your project limit is %{limit} projects! Please contact your administrator to increase it'
  • To: 'you've reached your project creation limit of %{limit} projects. Contact your GitLab administrator.'

  I've suggested trailing punctuation and lowercase at the start to make it work better with the Limit reached prefix. Ideally, Limit reached would be Limit reached: , or wouldn't appear at all.

• @cablett started a discussion: (+3 comments)

  

  Looks good! I'm happy with this @eduardosanz ! I've left a minor suggestion for your spec. Nearly there! 💪