elevation field: add unit "(Meters)" to label, fixes #95

data/fields/ele.json

@@ -2,7 +2,7 @@
     "key": "ele",
     "type": "number",
     "icon": "elevation",
-    "label": "Elevation",
+    "label": "Elevation (Meters)",
     "geometry": ["line", "area", "relation"],
     "terms": [
         "altitude",

data/fields/ele_node.json

@@ -2,7 +2,7 @@
     "key": "ele",
     "type": "number",
     "icon": "elevation",
-    "label": "Elevation",
+    "label": "Elevation (Meters)",
     "universal": true,
     "geometry": ["point", "vertex"],
     "terms": [