Make Ukrainian locale name follow ISO, update it and add tests

Author: nykula

src/pendulum/locales/locale.py

@@ -53,7 +53,11 @@ def normalize_locale(cls, locale: str) -> str:
         if m:
             return f"{m.group(1).lower()}_{m.group(2).lower()}"
         else:
-            return locale.lower()
+            lower = locale.lower()
+            if lower == 'ua':
+                # Backward compatibility. Ukrainian was 'ua' initially.
+                lower = 'uk'
+            return lower
 
     def get(self, key: str, default: Any | None = None) -> Any:
         if key in self._key_cache:

src/pendulum/locales/ua/locale.py

@@ -1,23 +1,23 @@
-"""
-ua custom locale file.
-"""
-from __future__ import annotations
-
-
-translations = {
-    "units": {"few_second": "кілька секунд"},
-    # Relative time
-    "ago": "{} тому",
-    "from_now": "за {}",
-    "after": "{0} посіля",
-    "before": "{0} до",
-    # Date formats
-    "date_formats": {
-        "LTS": "HH:mm:ss",
-        "LT": "HH:mm",
-        "L": "DD.MM.YYYY",
-        "LL": "D MMMM YYYY р.",
-        "LLL": "D MMMM YYYY р., HH:mm",
-        "LLLL": "dddd, D MMMM YYYY р., HH:mm",
-    },
-}
+"""
+uk custom locale file.
+"""
+from __future__ import annotations
+
+
+translations = {
+    "units": {"few_second": "кілька секунд"},
+    # Relative time
+    "ago": "{} тому",
+    "from_now": "через {}",
+    "after": "через {0}",
+    "before": "{0} тому",
+    # Date formats
+    "date_formats": {
+        "LTS": "HH:mm:ss",
+        "LT": "HH:mm",
+        "L": "DD.MM.YYYY",
+        "LL": "D MMMM YYYY",
+        "LLL": "D MMMM YYYY, HH:mm",
+        "LLLL": "ddd, D MMMM YYYY, HH:mm",
+    },
+}