显示换源进度 (#4893)

* change source progress

* format，隐藏初始状态

* resolve PR comment

* resolve PR comment1

* resolve PR comment2

app/src/main/res/values-pt-rBR/strings.xml

@@ -1140,6 +1140,7 @@
     <string name="export_book_notification_content">正在导出(%1$s),还有%2$d本待导出</string>
     <string name="export_md">导出(MD)</string>
     <string name="change_source_delay">换源间隔</string>
+    <string name="change_source_progress">" Resultado %1$d, progresso atual %2$d / %3$d: %4$s"</string>
     <string name="open_book_info_by_click_title">点击书名打开详情</string>
     <string name="export_wait">等待导出</string>
     <string name="default_home_page">默认主页</string>