Use https in more places and fix a few redirects.

site/_data/translations.yml

@@ -1,12 +1,12 @@
 - name: 中文(繁體)
   code: zh-tw
   description: Bootstrap 4 繁體中文手冊
-  url: http://bootstrap.hexschool.com/
+  url: https://bootstrap.hexschool.com/
 
 - name: Chinese
   code: zh
   description: Bootstrap 4 · 全球最流行的 HTML、CSS 和 JS 工具库。
-  url: https://code.z01.com/v4
+  url: https://code.z01.com/v4/
 
 - name: Chinese
   code: zh
@@ -16,4 +16,4 @@
 - name: Brazilian Portuguese
   code: pt-BR
   description: Bootstrap 4 Português do Brasil
-  url: http://getbootstrap.com.br/v4/
+  url: https://getbootstrap.com.br/v4/