do not emit language options for orphan translations

Author: bishabosha

_includes/sidebar-toc-multipage-overview.html

@@ -50,9 +50,10 @@ <h5 class="contents">Contents</h5>
             <li><a href="{{ site.baseurl }}/{{ l }}/{{ rootTutorialURL }}" class="lang">{{ lang.name }}</a></li>
           {% endfor %}
         </ul>
-      {% elsif page.language %}
-         {% assign engPath = page.id | remove_first: "/" | remove_first: page.language | append: '.html' %}
-         {% assign engPg = site.overviews | where: 'partof', page.partof | first %}
+      {% elsif page.language and page.orphanTranslation == false %}
+        <!-- i.e. some pages like '/zh-cn/thanks.html' have no english version -->
+        {% assign engPath = page.id | remove_first: "/" | remove_first: page.language | append: '.html' %}
+        {% assign engPg = site.overviews | where: 'partof', page.partof | first %}
         <ul id="available-languages" style="display: none;">
           <li><a href="{{ site.baseurl }}{{ engPath }}">English</a></li>
           {% for l in engPg.languages %}

_includes/sidebar-toc-singlepage-overview.html

@@ -9,13 +9,14 @@ <h5 class="contents">Contents</h5>
           {% for l in page.languages %}
             {% capture intermediate %}{{ page.url }}{% endcapture %}
             {% capture rootTutorialURL %}{{ intermediate | remove_first: '/' }}{% endcapture %}
-      			{% assign lang = site.data.languages[l] %}
-      			<li><a href="{{ site.baseurl }}/{{ l }}/{{ rootTutorialURL }}" class="lang">{{ lang.name }}</a></li>
+            {% assign lang = site.data.languages[l] %}
+            <li><a href="{{ site.baseurl }}/{{ l }}/{{ rootTutorialURL }}" class="lang">{{ lang.name }}</a></li>
           {% endfor %}
         </ul>
-      {% elsif page.language %}
-         {% assign engPath = page.id | remove_first: "/" | remove_first: page.language | append: '.html' %}
-         {% assign engPg = site.overviews | where: 'partof', page.partof | first %}
+      {% elsif page.language and page.orphanTranslation == false %}
+        <!-- i.e. some pages like '/zh-cn/thanks.html' have no english version -->
+        {% assign engPath = page.id | remove_first: "/" | remove_first: page.language | append: '.html' %}
+        {% assign engPg = site.overviews | where: 'partof', page.partof | first %}
         <ul id="available-languages" style="display: none;">
           <li><a href="{{ site.baseurl }}{{ engPath }}">English</a></li>
           {% for l in engPg.languages %}

_zh-cn/overviews/thanks.md

@@ -2,6 +2,7 @@
 layout: singlepage-overview
 language: zh-cn
 title: 致谢名单
+orphanTranslation: true
 ---
 
 2013年10月份起，CSDN CODE开始组织志愿者翻译Scala官方文档。计划翻译的文档主要为Scala官网上overview部分的内容，包含以下部分：

_zh-cn/thanks.md

@@ -2,6 +2,7 @@
 layout: singlepage-overview
 language: zh-cn
 title: 致谢名单
+orphanTranslation: true
 ---
 
 2013年10月份起，CSDN CODE开始组织志愿者翻译Scala官方文档。计划翻译的文档主要为Scala官网上overview部分的内容，包含以下部分：