Add db.query.default_language for testing purposes

Author: NataliaIvakina

modules/ROOT/pages/configuration/configuration-settings.adoc

@@ -1777,6 +1777,22 @@ They can be used to tune the performance of Cypher queries or to restrict the ki
 For more information, see xref:/performance/statistics-execution-plans.adoc[Statistics and execution plans].
 
 
+[role=label--new-2025.06]
+[[config_db.query.default_language]]
+=== `db.query.default_language`
+
+.db.query.default_language
+[frame="topbot", stripes=odd, grid="cols", cols="<1s,<4"]
+|===
+|Description
+a|The default language of a database determines which language is used to evaluate queries that do not explicitly select a language. This setting determines the default language used for new (and initial) databases where not specified as part of `CREATE` or `ALTER` database.
+|Valid values
+a|One of [CYPHER_5, CYPHER_25]
+|Default value
+m|+++CYPHER_5+++
+|===
+
+
 [[config_dbms.cypher.forbid_exhaustive_shortestpath]]
 === `dbms.cypher.forbid_exhaustive_shortestpath`