stop lock task mode with notification

close #36

app/src/main/res/values-tr/strings.xml

@@ -50,6 +50,7 @@
     <string name="io_exception">G/Ç Hatası</string>
     <string name="current_status_is">Mevcut Durum: </string>
     <string name="start">Başlat</string>
+    <string name="stop">Stop</string> <!--TODO-->
     <string name="unknown_error">Bilinmeyen Hata</string>
     <string name="allow_all">Tümünü İzin Ver</string>
     <string name="use_policy">Politika Kullan</string>

app/src/main/res/values-zh-rCN/strings.xml

@@ -47,6 +47,7 @@
     <string name="io_exception">IO异常</string>
     <string name="current_status_is">当前状态：</string>
     <string name="start">开始</string>
+    <string name="stop">停止</string>
     <string name="unknown_error">未知错误</string>
     <string name="allow_all">允许全部</string>
     <string name="use_policy">使用策略</string>

app/src/main/res/values/strings.xml

@@ -50,6 +50,7 @@
     <string name="io_exception">IO Exception</string>
     <string name="current_status_is">Current status: </string>
     <string name="start">Start</string>
+    <string name="stop">Stop</string>
     <string name="unknown_error">Unknown error</string>
     <string name="allow_all">Allow all</string>
     <string name="use_policy">Use policy</string>