Translation: Add missing entry for new "code" tab

We have new tab, but we had no entry. That's why it was showing "code"
(lowercase) as this is text id, where we were expecting properly title cased
"Code" to be shown in English version.

Also add Polish translation "code=Kod".

conf/locale/locale_zh-HK.ini

@@ -388,6 +388,7 @@ create_new_repo_command=從命令行創建一個新的倉庫
 push_exist_repo=從命令行推送已經創建的倉庫
 repo_is_empty=This repository is empty, please come back later!
 
+code=Code
 branch=分支
 tree=目錄樹
 filter_branch_and_tag=Filter branch or tag