fix(i18n): translation fix in server side generated time grains (#29951)

diff --git a/superset/db_engine_specs/base.py b/superset/db_engine_specs/base.py
index 0b42121..438154f 100644
--- a/superset/db_engine_specs/base.py
+++ b/superset/db_engine_specs/base.py
@@ -114,25 +114,25 @@
 
 
 builtin_time_grains: dict[str | None, str] = {
-    TimeGrainConstants.SECOND: __("Second"),
-    TimeGrainConstants.FIVE_SECONDS: __("5 second"),
-    TimeGrainConstants.THIRTY_SECONDS: __("30 second"),
-    TimeGrainConstants.MINUTE: __("Minute"),
-    TimeGrainConstants.FIVE_MINUTES: __("5 minute"),
-    TimeGrainConstants.TEN_MINUTES: __("10 minute"),
-    TimeGrainConstants.FIFTEEN_MINUTES: __("15 minute"),
-    TimeGrainConstants.THIRTY_MINUTES: __("30 minute"),
-    TimeGrainConstants.HOUR: __("Hour"),
-    TimeGrainConstants.SIX_HOURS: __("6 hour"),
-    TimeGrainConstants.DAY: __("Day"),
-    TimeGrainConstants.WEEK: __("Week"),
-    TimeGrainConstants.MONTH: __("Month"),
-    TimeGrainConstants.QUARTER: __("Quarter"),
-    TimeGrainConstants.YEAR: __("Year"),
-    TimeGrainConstants.WEEK_STARTING_SUNDAY: __("Week starting Sunday"),
-    TimeGrainConstants.WEEK_STARTING_MONDAY: __("Week starting Monday"),
-    TimeGrainConstants.WEEK_ENDING_SATURDAY: __("Week ending Saturday"),
-    TimeGrainConstants.WEEK_ENDING_SUNDAY: __("Week ending Sunday"),
+    TimeGrainConstants.SECOND: _("Second"),
+    TimeGrainConstants.FIVE_SECONDS: _("5 second"),
+    TimeGrainConstants.THIRTY_SECONDS: _("30 second"),
+    TimeGrainConstants.MINUTE: _("Minute"),
+    TimeGrainConstants.FIVE_MINUTES: _("5 minute"),
+    TimeGrainConstants.TEN_MINUTES: _("10 minute"),
+    TimeGrainConstants.FIFTEEN_MINUTES: _("15 minute"),
+    TimeGrainConstants.THIRTY_MINUTES: _("30 minute"),
+    TimeGrainConstants.HOUR: _("Hour"),
+    TimeGrainConstants.SIX_HOURS: _("6 hour"),
+    TimeGrainConstants.DAY: _("Day"),
+    TimeGrainConstants.WEEK: _("Week"),
+    TimeGrainConstants.MONTH: _("Month"),
+    TimeGrainConstants.QUARTER: _("Quarter"),
+    TimeGrainConstants.YEAR: _("Year"),
+    TimeGrainConstants.WEEK_STARTING_SUNDAY: _("Week starting Sunday"),
+    TimeGrainConstants.WEEK_STARTING_MONDAY: _("Week starting Monday"),
+    TimeGrainConstants.WEEK_ENDING_SATURDAY: _("Week ending Saturday"),
+    TimeGrainConstants.WEEK_ENDING_SUNDAY: _("Week ending Sunday"),
 }