The entity labels in the following locations have been fixed:
- search facet title: plural
- details facet title: singular
- association facet title: singular
- breadcrumb: plural
- adder dialog title: singular
- deleter dialog title: plural
Some entity labels have been changed into the correct plural form.
Unused file install/ui/test/data/i18n_messages.json has been removed.
Ticket #1249
Ticket #1387