Reword error when user cannot create a project due to project creation limits
The following discussions from !91610 should be addressed:
- [ ] @eduardosanz started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/91610#note_1044678835): (+3 comments)
> Change the text of these errors org/gitlab/-/blob/f9ddd3f18c1075f28b806657af625f103142d140/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](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/91610#note_1045818193): (+3 comments)
> 
>
> Looks good! I'm happy with this @eduardosanz ! I've left a minor suggestion for your spec. Nearly there! :muscle:
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