Add better deprecation descriptions

apps/locale/locale.html

@@ -209,7 +209,7 @@ exports = {
     }
     return s.substr(0, i + 3) + r + (d ? '${locale.decimal_point}' + d: '');
   },
-  currency: n => {console.log("Warning: Currency information is deprecated");return ${js("£")}+exports.number(n)},
+  currency: n => {console.log("Warning: Currency information is deprecated, see https://github.com/espruino/BangleApps/issues/3269");return ${js("£")}+exports.number(n)},
   distance: (n,dp) => n < ${distanceUnits[locale.distance[1]]} ? round(${unitConv(distanceUnits[locale.distance[0]])},dp) + ${js(locale.distance[0])} : round(${unitConv(distanceUnits[locale.distance[1]])},dp) + ${js(locale.distance[1])},
   speed: (n,dp) => round(${unitConv(speedUnits[locale.speed])},dp) + ${js(locale.speed)},
   temp: (t,dp) => round(${temperature},dp) + ${js(locale.temperature)},

typescript/types/locale.d.ts

@@ -3,12 +3,20 @@ declare module Locale {
 
   type Locale = {
     name: string,
-    /** @deprecated */
+    /**
+     * @deprecated
+     * There was no use case for this variable.
+     * For more details, see https://github.com/espruino/BangleApps/issues/3269
+     */
     currencySym: string,
     dow(date: Date, short?: ShortBoolean): string,
     month(date: Date, short?: ShortBoolean): string,
     number(n: number): string,
-    /** @deprecated */
+    /**
+     * @deprecated
+     * There was no use case for this method.
+     * For more details, see https://github.com/espruino/BangleApps/issues/3269
+     */
     currency(c: number): string,
     distance(d: number): string,
     speed(s: number): string,