fill in localizations using wikipedia

If a feature has a wikipedia tag, then all
translated page titles are fetched. If a user
starts adding a localized name for a language with
an available translation, that translation gets
filled in automatically.

js/id/services/wikipedia.js

@@ -14,7 +14,7 @@ iD.wikipedia  = function() {
                 callback: '{callback}',
                 srsearch: query
             }), function(data) {
-                if (!data.query) return console.log("resp", data);
+                if (!data.query) return
                 callback(query, data.query.search.map(function(d) {
                     return d.title;
                 }));
@@ -35,5 +35,27 @@ iD.wikipedia  = function() {
                 callback(d[0], d[1]);
             });
     };
+
+    wiki.translations = function(lang, title, callback) {
+        d3.jsonp(endpoint.replace('en', lang) +
+            iD.util.qsString({
+                action: 'query',
+                prop: 'langlinks',
+                format: 'json',
+                callback: '{callback}',
+                lllimit: 500,
+                titles: title
+            }), function(d) {
+                var list = d.query.pages[Object.keys(d.query.pages)[0]],
+                    translations = {};
+                if (list) {
+                    list.langlinks.forEach(function(d) {
+                        translations[d.lang] = d['*'];
+                    });
+                    callback(translations);
+                }
+            });
+    };
+
     return wiki;
 };

js/id/ui/preset/localized.js

@@ -1,7 +1,8 @@
 iD.ui.preset.localized = function(field, context) {
 
     var event = d3.dispatch('change', 'close'),
-        input, localizedInputs;
+        wikipedia = iD.wikipedia(),
+        input, localizedInputs, wikiTitles;
 
     function i(selection) {
 
@@ -22,6 +23,7 @@ iD.ui.preset.localized = function(field, context) {
 
         localizedInputs = selection.append('div')
             .attr('class', 'localized-wrap');
+
     }
 
     function addBlank() {
@@ -49,7 +51,13 @@ iD.ui.preset.localized = function(field, context) {
         if (language) value = language[2];
 
         t[key(d.lang)] = '';
-        if (d.value) t[key(value)] = d.value;
+
+        if (d.value) {
+            t[key(value)] = d.value;
+        } else if (wikiTitles && wikiTitles[d.lang]) {
+            t[key(value)] = wikiTitles[d.lang];
+        }
+
         event.change(t);
 
         d.lang = value;
@@ -126,6 +134,18 @@ iD.ui.preset.localized = function(field, context) {
     }
 
     i.tags = function(tags) {
+
+        // Fetch translations from wikipedia
+        if (tags.wikipedia && !wikiTitles) {
+            wikiTitles = {};
+            var wm = tags.wikipedia.match(/([^:]+):(.+)/);
+            if (wm && wm[0] && wm[1]) {
+                wikipedia.translations(wm[1], wm[2], function(d) {
+                    wikiTitles = d;
+                });
+            }
+        }
+
         input.property('value', tags[field.key] || '');
 
         var postfixed = [];