Merge pull request #5537 from DSpace/backport-5530-to-dspace-9_x

[Port dspace-9_x] fix(i18n): correct article usage in dso-selector placeholder

Author: tdonohue

src/assets/i18n/en.json5

@@ -1785,7 +1785,7 @@
 
   "dso-selector.no-results": "No {{ type }} found",
 
-  "dso-selector.placeholder": "Search for a {{ type }}",
+  "dso-selector.placeholder": "Search for {{ type }}",
 
   "dso-selector.placeholder.type.community": "community",
 
@@ -4505,7 +4505,7 @@
 
   "resource-policies.form.eperson-group-list.select.btn": "Select",
 
-  "resource-policies.form.eperson-group-list.tab.eperson": "Search for a ePerson",
+  "resource-policies.form.eperson-group-list.tab.eperson": "Search for an ePerson",
 
   "resource-policies.form.eperson-group-list.tab.group": "Search for a group",