v2.7.4: Named location presets and tappable nearest-airport ticker

Location presets can now optionally be given a name (e.g. "Home"),
shown in the overview instead of the raw coordinates. The
nearest-airport ticker on the Location Presets screen is now
tappable (shown with a thin green border) and adds that airport
directly as a new preset with its name and coordinates, using the
existing local airport database on the SD card - no internet lookup
needed. AirportLookup::findNearest() now also returns the found
airport's own lat/lon for this purpose.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/i18n.h

@@ -196,6 +196,14 @@ enum class StringId : uint8_t {
     MENU_LOGBOOK_WARNING_TITLE,
     MENU_LOGBOOK_WARNING_BODY,
 
+    // Preset-Name beim Anlegen (optional), "Presets voll"-Hinweis beim
+    // Antippen der Naechster-Flughafen-Laufschrift, sowie ein zusaetzlicher
+    // Info-Absatz dazu (Menue > Flugoptionen > Standort-Presets > "?").
+    LOCATION_NAME_PROMPT,
+    LOCATION_NAME_SKIP,
+    LOCATION_PRESETS_FULL,
+    LOCATION_INFO_PARA5,
+
     COUNT
 };