Added OSD Up/Down reference element

Added control for OSD up/down reference to OSD tab.

locales/en/messages.json

@@ -4965,7 +4965,13 @@
     "osdDescTotalFlights": {
         "message": "Approximate total number of flights"
     },
-
+    "osdTextElementUpDownReference": {
+        "message": "Up (Pitch 90 deg)/Down (Pitch -90 deg) Reference",
+        "description": "OSD Symbol to show when pitch is approaching vertical (90 deg, U) and D for nose down (-90 deg, D)"
+    },
+    "osdDescUpDownReference": {
+        "message": "OSD Symbol to show when pitch is approaching vertical (90 deg, U) and D for nose down (-90 deg, D)"
+    },
     "osdTextElementUnknown": {
         "message": "Unknown $1",
         "description": "One of the elements of the OSD"

src/js/tabs/osd.js

@@ -1181,6 +1181,21 @@ OSD.loadDisplayFields = function() {
             positionable: true,
             preview: "#9876",
         },
+        UP_DOWN_REFERENCE: {
+            name: 'UP_DOWN_REFERENCE',
+            text: 'osdTextElementUpDownReference',
+            desc: 'osdDescUpDownReference',
+            defaultPosition() {
+                let position = 238;
+                if (OSD.constants.VIDEO_TYPES[OSD.data.video_system] !== 'NTSC') {
+                    position += FONT.constants.SIZES.LINE;
+                }
+                return position;
+            },
+            draw_order: 465,
+            positionable: true,
+            preview: 'U',
+        },
     };
 };
 
@@ -1602,6 +1617,7 @@ OSD.chooseFields = function() {
                                                 if (semver.gte(FC.CONFIG.apiVersion, API_VERSION_1_44)) {
                                                     OSD.constants.DISPLAY_FIELDS = OSD.constants.DISPLAY_FIELDS.concat([
                                                         F.TOTAL_FLIGHTS,
+                                                        F.UP_DOWN_REFERENCE,
                                                     ]);
                                                 }
                                             }