Fixed batchInsert casting of double values according to locale (#14448)

fixes #6526

framework/db/pgsql/QueryBuilder.php

@@ -305,6 +305,9 @@ class QueryBuilder extends \yii\db\QueryBuilder
                 }
                 if (is_string($value)) {
                     $value = $schema->quoteValue($value);
+                } elseif (is_float($value)) {
+                    // ensure type cast always has . as decimal separator in all locales
+                    $value = str_replace(',', '.', (string) $value);
                 } elseif ($value === true) {
                     $value = 'TRUE';
                 } elseif ($value === false) {