[i777] - collection metadata clean up

- updates styling to make labels bold in the collection form
- updates locale helper method to account for collection resources

Issue:
- scientist-softserv/adventist_knapsack#777

app/assets/stylesheets/hyrax.scss

@@ -25,3 +25,8 @@
     background: #ffff00;
   font-weight: 700;
 }
+
+// to make collection form labels bold
+#collection-edit-controls label.control-label {
+  font-weight: bold;
+}

app/helpers/application_helper.rb

@@ -48,11 +48,11 @@ def hint_for(term:, record_class: nil)
   def locale_for(type:, term:, record_class:)
     term              = term.to_s
     record_class      = record_class.to_s.downcase
-    work_or_collection = record_class == 'collection' ? 'collection' : 'defaults'
+    work_or_collection = record_class == Hyrax.config.collection_model.downcase ? 'collection' : 'defaults'
     locale             = t("hyrax.#{record_class}.#{type}.#{term}")
 
     if missing_translation(locale)
-      (t("simple_form.#{type}.#{work_or_collection}.#{term}") || term.titleize) .html_safe
+      (t("simple_form.#{type}.#{work_or_collection}.#{term}")).try(:html_safe)
     else
       locale.html_safe
     end