Update Traditional Chinese, HK (zh-HK) translation (#1759)

* Fix missing string in javascript locale (zh-HK)

* Change javascript locale (zh-HK)

* Fix some other strings that were still English.
* Improve `search.status_by`.
* Fix `notification.follow`. ("開始開始你")
* Changes according to user feedback.
  * "Back": "較前顯示" -> "返回"
  * "Home": "家" -> "主頁"

* Update ruby locale (zh-HK)

* Fix missing translation
* Normalize yml
* Update translation strings

config/locales/simple_form.zh-HK.yml

@@ -26,7 +26,9 @@ zh-HK:
         note: 簡介
         otp_attempt: 雙重認證碼
         password: 密碼
+        setting_boost_modal: 在轉推前詢問我
         setting_default_privacy: 文章預設私隱度
+        severity: 等級
         type: 匯入資料類型
         username: 用戶名稱
       interactions:
@@ -39,8 +41,8 @@ zh-HK:
         follow_request: 當有用戶要求關注你時，發電郵通知
         mention: 當有用戶在文章提及你時，發電郵通知
         reblog: 當有用戶轉推你的文章時，發電郵通知
-    'no': '否'
+    'no': 否
     required:
       mark: "*"
       text: 必須填寫
-    'yes': '是'
+    'yes': 是