Reduce prominence of share links, add G+

data/core.yaml

@@ -216,7 +216,8 @@ en:
     just_edited: "You just edited OpenStreetMap!"
     view_on_osm: "View on OSM"
     facebook: "Share on Facebook"
-    tweet: "Tweet"
+    twitter: "Share on Twitter"
+    google: "Share on Google+"
     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>).