Translated using Weblate (#4109)

Co-authored-by: Eryk Michalak <gnu.ewm@protonmail.com>
Co-authored-by: Kevin Papst <kevin@kevinpapst.de>
Co-authored-by: Massimo Pissarello <mapi68@gmail.com>
Co-authored-by: Matthew Durajka <logrcz@gmail.com>
Co-authored-by: Matúš Bulla <matbull12345@gmail.com>
Co-authored-by: Milo Ivir <mail@milotype.de>
Co-authored-by: SC <lalocas@protonmail.com>
Co-authored-by: Sergii Horichenko <m@sgg.im>
Co-authored-by: Wellington Terumi Uemura <wellingtonuemura@gmail.com>
Co-authored-by: Yaron Shahrabani <sh.yaron@gmail.com>
Co-authored-by: Yonggen <vizualizer@gmail.com>
Co-authored-by: bigvictorio <bigvictorio12345@gmail.com>
Co-authored-by: yangyangdaji <1504305527@qq.com>

translations/flashmessages.sk.xlf

@@ -50,6 +50,10 @@
         <source>action.upload.error</source>
         <target>Súbor nebolo možné nahrať alebo uložiť: %reason%</target>
       </trans-unit>
+      <trans-unit resname="action.csrf.error" id="bOE_q5R">
+        <source>action.csrf.error</source>
+        <target state="translated">Akciu nebolo možné vykonať: neplatný bezpečnostný token.</target>
+      </trans-unit>
     </body>
   </file>
 </xliff>