Translations update from Weblate (#2717)

Co-authored-by: dkstiler <dkstiler@gmail.com>
Co-authored-by: J. Lavoie <j.lavoie@net-c.ca>
Co-authored-by: Ville Kovacs <regpile@mailbox.org>
Co-authored-by: Simona Iacob <s@zp1.net>
Co-authored-by: Andrea Martini <andrea.martini.7002@gmail.com>
Co-authored-by: Лолло Нуб <lollo.samp@mail.ru>
Co-authored-by: Peter Valo <pvalo@abcom.sk>
Co-authored-by: A M <augim3@gmail.com>
Co-authored-by: Yaron Shahrabani <sh.yaron@gmail.com>
Co-authored-by: Oğuz Ersen <oguzersen@protonmail.com>
Co-authored-by: Ana Carla Vasconcelos <anacarlavgs@gmail.com>
Co-authored-by: Kevin Papst <kpapst@gmx.net>

translations/validators.el.xlf

@@ -54,6 +54,10 @@
         <source>The entered passwords don't match.</source>
         <target>Τα διαπιστευτήρια που εισάγατε δεν ταυτίζονται.</target>
       </trans-unit>
+      <trans-unit id="At least one team leader must be assigned to the team.">
+        <source>At least one team leader must be assigned to the team.</source>
+        <target>Τουλάχιστο ένας αρχηγός ομάδας πρέπει να ανατεθεί στην ομάδα.</target>
+      </trans-unit>
     </body>
   </file>
 </xliff>