Extract component to show moderation actions

Note that in proposal notifications we're writing the call to
render the component in the same line as the <div class="reply">
definition in order to be able to use the `:empty` selector when the
component renders nothing. No browser matches whitespace with the
`:empty` selector, so we can't add newline characters inside the tag. A
more elegant solution would be extracting the proposal notification
actions to a component and only rendering it if the moderation actions
component is rendered.

app/components/shared/moderation_actions_component.rb

@@ -0,0 +1,34 @@
+class Shared::ModerationActionsComponent < ApplicationComponent
+  attr_reader :record
+  delegate :can?, to: :helpers
+
+  def initialize(record)
+    @record = record
+  end
+
+  def render?
+    can?(:hide, record) || can?(:hide, record.author)
+  end
+
+  private
+
+    def hide_path
+      polymorphic_path([:moderation, record], action: :hide)
+    end
+
+    def confirm_hide_text
+      t("admin.actions.confirm_action", action: t("admin.actions.hide"), name: record.human_name)
+    end
+
+    def confirm_hide_author_text
+      t("admin.actions.confirm_action", action: t("admin.actions.hide_author"), name: record.author.name)
+    end
+
+    def separator
+      if record.is_a?(Comment)
+        "&nbsp;&bull;&nbsp;"
+      else
+        "&nbsp;|&nbsp;"
+      end
+    end
+end