[FL-3024] Locale settings (#2137)

* Locale settings
* Time/date format fix
* Locale: add docs, enums for HAL, cleanup.

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/debug/locale_test/application.fam

@@ -0,0 +1,11 @@
+App(
+    appid="locale_test",
+    name="Locale Test",
+    apptype=FlipperAppType.DEBUG,
+    entry_point="locale_test_app",
+    cdefines=["APP_LOCALE"],
+    requires=["gui", "locale"],
+    stack_size=2 * 1024,
+    order=70,
+    fap_category="Debug",
+)