[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/services/locale/application.fam

@@ -0,0 +1,9 @@
+App(
+    appid="locale",
+    name="LocaleSrv",
+    apptype=FlipperAppType.STARTUP,
+    entry_point="locale_on_system_start",
+    cdefines=["SRV_LOCALE"],
+    order=90,
+    sdk_headers=["locale.h"],
+)