GeoInfo: format length and area with module format-unit

package.json

@@ -20,6 +20,7 @@
     "color-interpolate": "^1.0.5",
     "event-emitter": "^0.3.5",
     "file-saver": "^2.0.0",
+    "format-unit": "^1.0.6",
     "i18next-client": "^1.11.4",
     "ip-location": "^1.0.1",
     "json-multiline-strings": "^0.1.0",

src/formatUnits.js

@@ -1,12 +1,8 @@
-module.exports = {
-  distance: value => {
-    return value.toFixed(0) + 'm'
-  },
-
-  area: value => {
-    return value.toFixed(0) + 'm²'
-  },
+const formatUnit = require('format-unit').default
 
+module.exports = {
+  distance: value => formatUnit('length')(value)(['mm', 'cm', 'm', 'km']),
+  area: value => formatUnit('area')(value)(['cm2', 'm2', 'ha', 'km2']),
   coord: value => {
     return value.lat.toFixed(5) + ' ' + value.lng.toFixed(5)
   }