ui: add show source button

packages/ui-default/locales/zh.yaml

@@ -861,6 +861,7 @@ Sorry, there are no users in this domain.: 对不起，此域中没有用户。
 Sorry: 对不起
 Sort by: 排序
 Source type: 来源类型
+Source: 来源
 Standard mode: 标准模式
 Standard Program: 标准程序
 Star Topic: 收藏讨论

packages/ui-default/templates/problem_files.html

@@ -11,6 +11,8 @@
             <a href="{{ url('problem_config', pid=pdoc.docId) }}" class="primary rounded button">{{ _('Config') }}</a>
             <button class="primary rounded button" name="create_testdata">{{ _('Create') }}</button>
             <button class="primary rounded button" name="upload_testdata">{{ _('Upload') }}</button>
+          {% else %}
+            <a href="{{ url('problem_detail', domainId=pdoc.reference.domainId, pid=pdoc.reference.pid) }}" class="primary rounded button">{{ _('Source') }}</a>
           {% endif %}
         </div>
       </div>