update HK lang string

Author: microbit-mark

editor.html

@@ -374,7 +374,7 @@ <h2><i class="fa fa-unlock-alt"></i> <strong>{{ title }}</strong></h2>
                                 <li><span title="Polish"><a lang="pl" href="#" class="action lang-choice" id="pl" tabindex="123">Polski</a></span></li>
                                 <li><span title="Croatian"><a lang="hr" href="#" class="action lang-choice" id="hr" tabindex="124">Hrvatski</a></span></li>
                                 <li><span title="Chinese (simplified)"><a lang="zh-CN" href="#" class="action lang-choice" id="zh-CN" tabindex="125">简体中文</a></span></li>
-                                <li><span title="Chinese (Hong Kong)"><a lang="zh-HK" href="#" class="action lang-choice" id="zh-HK" tabindex="126">繁体中文</a></span></li>
+                                <li><span title="Chinese (Hong Kong)"><a lang="zh-HK" href="#" class="action lang-choice" id="zh-HK" tabindex="126">中文 (繁體，香港)</a></span></li>
                                 <li><span title="Chinese (Taiwan)"><a lang="zh-TW" href="#" class="action lang-choice" id="zh-TW" tabindex="127">中文（繁體，臺灣)</a></span></li>
                             </ul>
                             <div><a id="add-language-link" class="action" title="Add a language translation to the Editor" href="https://support.microbit.org/support/solutions/articles/19000106022-translating-the-micro-bit-python-editor" target="_blank" tabindex="129">Add a language</a></div>

lang/zh-HK.js

@@ -141,7 +141,7 @@ var language = {
       "title": "Chinese (simplified)"
     },
     "zh-HK": {
-      "title": "Chinese (traditional, Hong Kong)"
+      "title": "中文 (繁體，香港)"
     },
     "zh-TW": {
       "title": "Chinese (traditional, Taiwan)"