[FIX] purchase: es_AR translation typo

Fixing it directly by commit since there is no es_AR on transifex.

The issue of the ticket has been solved by transifex, this is for
another similar issue that has been found.

opw-1907924
closes #28923

addons/purchase/i18n/es_AR.po

@@ -27,7 +27,7 @@ msgstr "# de líneas"
 #: model:mail.template,subject:purchase.email_template_edi_purchase
 #: model:mail.template,subject:purchase.email_template_edi_purchase_done
 msgid "${object.company_id.name} Order (Ref ${object.name or 'n/a' })"
-msgstr "${object.company_id.name} Orden (Ref ${object.name o 'n/a' })"
+msgstr "${object.company_id.name} Orden (Ref ${object.name or 'n/a' })"
 
 #. module: purchase
 #: model:ir.model.fields,help:purchase.field_purchase_config_settings_group_uom