Revert #11993: new number format system does not and cannot work for CJK languages

There are too many intricacies that I am unaware of that are popping up after
asking whether things are right or not.
I do not want to keep playing whack-a-mole, so just revert the whole thing.

This reverts:
15be383b93
360fe8b0b6
1aa9a5c0ab
59f56941e5
7e2eefb91f
b741b2ba6f
609d0071d5
9f8fd80112
a253205b93
819c6c756e

src/saveload/compat/settings_sl_compat.h

@@ -258,9 +258,9 @@ const SaveLoadCompat _settings_sl_compat[] = {
 	SLC_VAR("locale.units_volume"),
 	SLC_VAR("locale.units_force"),
 	SLC_VAR("locale.units_height"),
-	SLC_NULL_STR(1, SLV_118, SLV_TABLE_CHUNKS),
-	SLC_NULL_STR(1, SLV_118, SLV_TABLE_CHUNKS),
-	SLC_NULL_STR(1, SLV_126, SLV_TABLE_CHUNKS),
+	SLC_VAR("locale.digit_group_separator"),
+	SLC_VAR("locale.digit_group_separator_currency"),
+	SLC_VAR("locale.digit_decimal_separator"),
 };
 
 #endif /* SAVELOAD_COMPAT_SETTINGS_H */