Update "No Visible Projects" Message

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

@@ -885,7 +885,7 @@ issue_bulk_change.no_match=There is no issue matching your filter selection
 
 projects.page=Projects
 projects._projects=projects
-projects.no_projects.empty_instance=There is no visible project yet.
+projects.no_projects.empty_instance=There are no visible projects yet.
 projects.no_projects.empty_instance.new_project=Once you analyze some projects, they will show up here.
 projects.no_projects.empty_instance.how_to_add_projects=Here is how you can analyse new projects
 projects.no_favorite_projects=You don't have any favorite projects yet.