After editing, give a sense when map is updated

Fixes #1660

css/app.css

@@ -2227,7 +2227,7 @@ img.wiki-image {
 }
 
 .modal-actions button,
-.save-success a {
+.save-success a.button {
     font-weight: normal;
     color: #7092FF;
     border-bottom: 1px solid #CCC;
@@ -2238,12 +2238,12 @@ img.wiki-image {
 }
 
 .modal-actions button:hover
-.save-success a:hover {
+.save-success a.button:hover {
     background-color: #ececec;
 }
 
 .modal-actions button:before,
-.save-success a:before,
+.save-success a.button:before,
 .walkthrough a:before {
     display: block;
     content: '';
@@ -2272,7 +2272,11 @@ img.wiki-image {
 /* Success Modal
 ------------------------------------------------------- */
 
-.save-success a {
+.save-success p {
+    padding: 15px;
+}
+
+.save-success .button {
     padding-top: 15px;
 }
 

data/core.yaml

@@ -136,9 +136,7 @@ en:
     tooltip: "Redo: {action}"
     nothing: Nothing to redo.
   tooltip_keyhint: "Shortcut:"
-  just_edited: "You just edited OpenStreetMap!"
   browser_notice: "This editor is supported in Firefox, Chrome, Safari, Opera, and Internet Explorer 9 and above. Please upgrade your browser or use Potlatch 2 to edit the map."
-  view_on_osm: "View on OSM"
   translate:
     translate: Translate
     localized_translation_label: Multilingual name
@@ -213,9 +211,13 @@ en:
     unsaved_changes: You have unsaved changes
   success:
     edited_osm: "Edited OSM!"
+    just_edited: "You just edited OpenStreetMap!"
+    view_on_osm: "View on OSM"
     facebook: "Share on Facebook"
     tweet: "Tweet"
-    okay: "Okay"
+    help_html: |
+      Your changes should appear in the "Standard" layer in a few minutes. Other layers, and certain features, may take longer
+      (<a href='https://help.openstreetmap.org/questions/4705/why-havent-my-changes-appeared-on-the-map'>details</a>).
   confirm:
     okay: "Okay"
   splash:

dist/locales/en.json

@@ -175,9 +175,7 @@
         "nothing": "Nothing to redo."
     },
     "tooltip_keyhint": "Shortcut:",
-    "just_edited": "You just edited OpenStreetMap!",
     "browser_notice": "This editor is supported in Firefox, Chrome, Safari, Opera, and Internet Explorer 9 and above. Please upgrade your browser or use Potlatch 2 to edit the map.",
-    "view_on_osm": "View on OSM",
     "translate": {
         "translate": "Translate",
         "localized_translation_label": "Multilingual name",
@@ -262,9 +260,11 @@
     },
     "success": {
         "edited_osm": "Edited OSM!",
+        "just_edited": "You just edited OpenStreetMap!",
+        "view_on_osm": "View on OSM",
         "facebook": "Share on Facebook",
         "tweet": "Tweet",
-        "okay": "Okay"
+        "help_html": "Your changes should appear in the \"Standard\" layer in a few minutes. Other layers, and certain features, may take longer\n(<a href='https://help.openstreetmap.org/questions/4705/why-havent-my-changes-appeared-on-the-map'>details</a>).\n"
     },
     "confirm": {
         "okay": "Okay"

js/id/ui/success.js

@@ -16,21 +16,24 @@ iD.ui.Success = function(context) {
             .on('click', function() { event.cancel(success) });
 
         header.append('h3')
-            .text(t('just_edited'));
+            .text(t('success.just_edited'));
 
         var body = selection.append('div')
             .attr('class', 'body save-success');
 
+        body.append('p')
+            .html(t('success.help_html'));
+
         body.append('a')
-            .attr('class', 'col12 osm')
+            .attr('class', 'button col12 osm')
             .attr('target', '_blank')
             .attr('href', function() {
                 return context.connection().changesetURL(changeset.id);
             })
-            .text(t('view_on_osm'));
+            .text(t('success.view_on_osm'));
 
         body.append('a')
-            .attr('class', 'col12 twitter')
+            .attr('class', 'button col12 twitter')
             .attr('target', '_blank')
             .attr('href', function() {
                 return 'https://twitter.com/intent/tweet?source=webclient&text=' +
@@ -39,7 +42,7 @@ iD.ui.Success = function(context) {
             .text(t('success.tweet'));
 
         body.append('a')
-            .attr('class', 'col12 facebook')
+            .attr('class', 'button col12 facebook')
             .attr('target', '_blank')
             .attr('href', function() {
                 return 'https://facebook.com/sharer/sharer.php?u=' +