Use CGI.unescapeHTML rather than doing the gsub with a map

app/models/label.rb

@@ -10,12 +10,6 @@ class Label < ActiveRecord::Base
 
   DEFAULT_COLOR = '#428BCA'
 
-  TABLE_FOR_ESCAPE_HTML_ENTITIES = {
-    '&' => '&amp;',
-    '<' => '&lt;',
-    '>' => '&gt;'
-  }
-
   default_value_for :color, DEFAULT_COLOR
 
   belongs_to :project
@@ -140,10 +134,6 @@ class Label < ActiveRecord::Base
   end
 
   def sanitize_title(value)
-    unescape_html_entities(Sanitize.clean(value.to_s))
-  end
-
-  def unescape_html_entities(value)
-    value.to_s.gsub(/(&gt;)|(&lt;)|(&amp;)/, TABLE_FOR_ESCAPE_HTML_ENTITIES.invert)
+    CGI.unescapeHTML(Sanitize.clean(value.to_s))
   end
 end

lib/banzai/filter/label_reference_filter.rb

@@ -68,7 +68,7 @@ module Banzai
       end
 
       def unescape_html_entities(text)
-        text.to_s.gsub(/(>)|(<)|(&)/, Label::TABLE_FOR_ESCAPE_HTML_ENTITIES.invert)
+        CGI.unescapeHTML(text.to_s)
       end
     end
   end