Add locale zh-HK (Traditional Chinese)

conf/app.ini

@@ -258,5 +258,5 @@ CONN =
 MAX_GITDIFF_LINES = 10000
 
 [i18n]
-LANGS = en-US,zh-CN,de-DE,fr-CA,nl-NL
-NAMES = English,简体中文,Deutsch,Français,Nederlands
+LANGS = en-US,zh-CN,zh-HK,de-DE,fr-CA,nl-NL
+NAMES = English,简体中文,繁體中文,Deutsch,Français,Nederlands