Use an Enum class for the Reviewable Priority Site Setting

app/models/reviewable_priority_setting.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require_dependency 'enum_site_setting'
+
+class ReviewablePrioritySetting < EnumSiteSetting
+
+  def self.valid_value?(val)
+    values.any? { |v| v[:value].to_s == val.to_s }
+  end
+
+  def self.values
+    Reviewable.priorities.map do |p|
+      { name: I18n.t("reviewables.priorities.#{p[0]}"), value: p[0] }
+    end
+  end
+
+  def self.translate_names?
+    false
+  end
+
+end