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_bg-BG.ini

@@ -388,6 +388,7 @@ create_new_repo_command=Създай ново хранилище чрез ком
 push_exist_repo=Предай съществуващо хранилище през командния ред
 repo_is_empty=Това хранилище е празно. Моля проверете по-късно пак!
 
+code=Code
 branch=Клон
 tree=ИН на ревизия
 filter_branch_and_tag=Филтър по маркер или клон