Tweak manual project provisioning wording

sonar-core/src/main/resources/org/sonar/l10n/core.properties

@@ -2767,7 +2767,7 @@ onboarding.create_project.x_repository_created_as_private={0} repositories will
 onboarding.create_project.no_repositories=No repositories found for this organization.
 onboarding.create_project.organization=Organization
 onboarding.create_project.project_key=Project key
-onboarding.create_project.project_key.description=Up to 400 characters. All letters, digits, dash, underscore, point or colon.
+onboarding.create_project.project_key.description=Up to 400 characters. All letters, digits, dash, underscore, period or colon.
 onboarding.create_project.project_key.error=The provided value doesn't match the expected format.
 onboarding.create_project.project_key.help=Your project key is a unique identifier for your project.
 onboarding.create_project.project_key.taken=This project key is already taken.