Update Finnish locale

Use the correct declension for singular second and day, and remove the
"muutama" from the plural seconds (seems to be old mishap with
localization).

Author: aivot-on

arrow/locales.py

@@ -867,13 +867,13 @@ class FinnishLocale(Locale):
 
     timeframes: ClassVar[Mapping[TimeFrameLiteral, Union[str, Mapping[str, str]]]] = {
         "now": "juuri nyt",
-        "second": "sekunti",
-        "seconds": {"past": "{0} muutama sekunti", "future": "{0} muutaman sekunnin"},
+        "second": {"past": "sekunti", "future": "sekunnin"},
+        "seconds": {"past": "{0} sekuntia", "future": "{0} sekunnin"},
         "minute": {"past": "minuutti", "future": "minuutin"},
         "minutes": {"past": "{0} minuuttia", "future": "{0} minuutin"},
         "hour": {"past": "tunti", "future": "tunnin"},
         "hours": {"past": "{0} tuntia", "future": "{0} tunnin"},
-        "day": "päivä",
+        "day": {"past": "päivä", "future": "päivän"},
         "days": {"past": "{0} päivää", "future": "{0} päivän"},
         "month": {"past": "kuukausi", "future": "kuukauden"},
         "months": {"past": "{0} kuukautta", "future": "{0} kuukauden"},

tests/test_locales.py

@@ -1111,9 +1111,9 @@ def test_format_timeframe(self):
 
         # Second(s)
         assert self.locale._format_timeframe("second", -1) == "sekunti"
-        assert self.locale._format_timeframe("second", 1) == "sekunti"
-        assert self.locale._format_timeframe("seconds", -2) == "2 muutama sekunti"
-        assert self.locale._format_timeframe("seconds", 2) == "2 muutaman sekunnin"
+        assert self.locale._format_timeframe("second", 1) == "sekunnin"
+        assert self.locale._format_timeframe("seconds", -2) == "2 sekuntia"
+        assert self.locale._format_timeframe("seconds", 2) == "2 sekunnin"
 
         # Minute(s)
         assert self.locale._format_timeframe("minute", -1) == "minuutti"
@@ -1129,7 +1129,7 @@ def test_format_timeframe(self):
 
         # Day(s)
         assert self.locale._format_timeframe("day", -1) == "päivä"
-        assert self.locale._format_timeframe("day", 1) == "päivä"
+        assert self.locale._format_timeframe("day", 1) == "päivän"
         assert self.locale._format_timeframe("days", -2) == "2 päivää"
         assert self.locale._format_timeframe("days", 2) == "2 päivän"