Add more server side unicode replacements for emoji

app/models/emoji.rb

@@ -119,7 +119,16 @@ class Emoji
   end
 
   def self.unicode_replacements
-    @unicode_replacements ||= Hash[db.map {|e| [e['emoji'], e['aliases'][0]] }]
+    return @unicode_replacements if @unicode_replacements
+
+    @unicode_replacements = Hash[db.map {|e| [e['emoji'], e['aliases'][0]] }]
+    @unicode_replacements["\u{2639}"] = 'frowning'
+    @unicode_replacements["\u{263A}"] = 'slightly_smiling'
+    @unicode_replacements["\u{263B}"] = 'slightly_smiling'
+    @unicode_replacements["\u{2661}"] = 'heart'
+    @unicode_replacements["\u{2665}"] = 'heart'
+
+    @unicode_replacements
   end
 
   def self.unicode_regexp

spec/components/pretty_text_spec.rb

@@ -385,6 +385,10 @@ HTML
       expect(PrettyText.cook("💣")).to match(/\:bomb\:/)
     end
 
+    it "replaces some glyphs that are not in the emoji range" do
+      expect(PrettyText.cook("☺")).to match(/\:slightly_smiling\:/)
+    end
+
     it "doesn't replace unicode emoji if emoji is disabled" do
       SiteSetting.enable_emoji = false 
       expect(PrettyText.cook("💣")).not_to match(/\:bomb\:/)