Fix union operator translation (#1820)

Closes #1818

Author: cmaureir

whatsnew/3.10.po

@@ -889,7 +889,7 @@ msgstr ""
 
 #: ../Doc/whatsnew/3.10.rst:716
 msgid "PEP 604: New Type Union Operator"
-msgstr "PEP 604: Nuevo tipo de operador sindical"
+msgstr "PEP 604: Nuevo tipo de operador unión"
 
 #: ../Doc/whatsnew/3.10.rst:718
 msgid ""

whatsnew/3.9.po

@@ -73,7 +73,7 @@ msgstr "Nuevas funciones de sintaxis:"
 
 #: ../Doc/whatsnew/3.9.rst:65
 msgid ":pep:`584`, union operators added to ``dict``;"
-msgstr ":pep:`584`, operadores sindicales agregados a ``dict``;"
+msgstr ":pep:`584`, operadores unión agregados a ``dict``;"
 
 #: ../Doc/whatsnew/3.9.rst:66
 msgid ":pep:`585`, type hinting generics in standard collections;"