Fix tests for Spanish long scale translations

Update test expectations to match new long scale translations.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sedat4ras

tests/test_i18n.py

@@ -99,10 +99,10 @@ def test_naturaldelta() -> None:
         # Spanish uses dot as decimal separator
         ("es_ES", 1_000_000, "1.0 millón"),
         ("es_ES", 3_500_000, "3.5 millones"),
-        ("es_ES", 1_000_000_000, "1.0 billón"),
-        ("es_ES", 1_200_000_000, "1.2 billones"),
-        ("es_ES", 1_000_000_000_000, "1.0 trillón"),
-        ("es_ES", 6_700_000_000_000, "6.7 trillones"),
+        ("es_ES", 1_000_000_000, "1.0 mil millones"),
+        ("es_ES", 1_200_000_000, "1.2 miles de millones"),
+        ("es_ES", 1_000_000_000_000, "1.0 billón"),
+        ("es_ES", 6_700_000_000_000, "6.7 billones"),
         ("fr_FR", "1_000", "1.0 mille"),
         ("fr_FR", "12_400", "12.4 milles"),
         ("fr_FR", "12_490", "12.5 milles"),