update fold text

src/Flows.js

@@ -1223,7 +1223,7 @@ class FlowItemRow extends PureComponent {
                   <span className="box-header-badge">
                     {this.needFold && ' 已折叠'}
                     {this.has_block_words && ' 已屏蔽'}
-                    {this.too_many_downvotes && '反对较多'}
+                    {this.too_many_downvotes && ' 争议较大'}
                   </span>
                   <div style={{ clear: 'both' }} />
                 </div>