use monkey patch to trancoding content

config/initializers/gitlabhq/20_grit_ext.rb

@@ -7,5 +7,23 @@ Grit::Blob.class_eval do
   include Utils::Colorize
 end
+#monkey patch raw_object from string
+Grit::GitRuby::Internal::RawObject.class_eval do
+  def content
+    transcoding(@content)
+  end
+
+  private
+  def transcoding(content)
+    content ||= ""
+    detection = CharlockHolmes::EncodingDetector.detect(content)
+    if hash = detection
+     content = CharlockHolmes::Converter.convert(content, hash[:encoding], 'UTF-8') if hash[:encoding]
+    end
+    content
+  end
+end
+
+
 Grit::Git.git_timeout = GIT_OPTS["git_timeout"]
 Grit::Git.git_max_size = GIT_OPTS["git_max_size"]