[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/locale.h

@@ -0,0 +1,107 @@
+#pragma once
+
+#include <stdbool.h>
+#include <furi.h>
+#include <furi_hal.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    LocaleMeasurementUnitsMetric = 0, /**< Metric measurement units */
+    LocaleMeasurementUnitsImperial = 1, /**< Imperial measurement units */
+} LocaleMeasurementUnits;
+
+typedef enum {
+    LocaleTimeFormat24h = 0, /**< 24-hour format */
+    LocaleTimeFormat12h = 1, /**< 12-hour format */
+} LocaleTimeFormat;
+
+typedef enum {
+    LocaleDateFormatDMY = 0, /**< Day/Month/Year */
+    LocaleDateFormatMDY = 1, /**< Month/Day/Year */
+    LocaleDateFormatYMD = 2, /**< Year/Month/Day */
+} LocaleDateFormat;
+
+/** Get Locale measurement units
+ *
+ * @return     The locale measurement units.
+ */
+LocaleMeasurementUnits locale_get_measurement_unit();
+
+/** Set locale measurement units
+ *
+ * @param[in]  format  The locale measurements units
+ */
+void locale_set_measurement_unit(LocaleMeasurementUnits format);
+
+/** Convert Fahrenheit to Celsius
+ *
+ * @param[in]  temp_f  The Temperature in Fahrenheit
+ *
+ * @return     The Temperature in Celsius 
+ */
+float locale_fahrenheit_to_celsius(float temp_f);
+
+/** Convert Celsius to Fahrenheit
+ *
+ * @param[in]  temp_c  The Temperature in Celsius 
+ *
+ * @return     The Temperature in Fahrenheit
+ */
+float locale_celsius_to_fahrenheit(float temp_c);
+
+/** Get Locale time format
+ *
+ * @return     The locale time format.
+ */
+LocaleTimeFormat locale_get_time_format();
+
+/** Set Locale Time Format
+ *
+ * @param[in]  format  The Locale Time Format
+ */
+void locale_set_time_format(LocaleTimeFormat format);
+
+/** Format time to furi string
+ *
+ * @param[out] out_str       The FuriString to store formatted time
+ * @param[in]  datetime      Pointer to the datetime
+ * @param[in]  format        The Locale Time Format
+ * @param[in]  show_seconds  The show seconds flag
+ */
+void locale_format_time(
+    FuriString* out_str,
+    const FuriHalRtcDateTime* datetime,
+    const LocaleTimeFormat format,
+    const bool show_seconds);
+
+/** Get Locale DateFormat
+ *
+ * @return     The Locale DateFormat.
+ */
+LocaleDateFormat locale_get_date_format();
+
+/** Set Locale DateFormat
+ *
+ * @param[in]  format  The Locale DateFormat
+ */
+void locale_set_date_format(LocaleDateFormat format);
+
+/** Format date to furi string
+ *
+ * @param[out] out_str    The FuriString to store formatted date
+ * @param[in]  datetime   Pointer to the datetime
+ * @param[in]  format     The format
+ * @param[in]  separator  The separator
+ */
+void locale_format_date(
+    FuriString* out_str,
+    const FuriHalRtcDateTime* datetime,
+    const LocaleDateFormat format,
+    const char* separator);
+
+#ifdef __cplusplus
+}
+#endif