Translated using Weblate (#3462)

Co-authored-by: Ahmed Saleh <sniperasa8@gmail.com>
Co-authored-by: Alireza Mousavi <alrzmsv@gmail.com>
Co-authored-by: Eric <alchemillatruth@purelymail.com>
Co-authored-by: Jiri Nakola <github@nakola.fi>
Co-authored-by: Simona Iacob <s@zp1.net>
Co-authored-by: yangyangdaji <1504305527@qq.com>

translations/flashmessages.zh_CN.xlf

@@ -50,6 +50,14 @@
         <source>invoice.first_template</source>
         <target>您必须先创立一个自己的发票模板</target>
       </trans-unit>
+      <trans-unit id="wejAEcR" resname="action.upload.error">
+        <source>action.upload.error</source>
+        <target state="translated">无法上载或保存文件：%reason%</target>
+      </trans-unit>
+      <trans-unit resname="action.csrf.error" id="bOE_q5R">
+        <source>action.csrf.error</source>
+        <target state="translated">无法执行该操作：安全令牌无效。</target>
+      </trans-unit>
     </body>
   </file>
 </xliff>