Shorten "Zoom in" text, don't hide it on narrow screens

Fixes #1477.

css/app.css

@@ -2600,7 +2600,6 @@ img.wiki-image {
 ------------------------------------------------------- */
 
 @media only screen and (max-width: 840px) {
-    #bar .label {display: none;}
     #bar .icon.icon-pre-text { margin-right: 0;}
     /* override hide for save button */
     #bar .save .label { display: block;}

data/core.yaml

@@ -141,7 +141,7 @@ en:
     localized_translation_label: Multilingual name
     localized_translation_language: Choose language
     localized_translation_name: Name
-  zoom_in_edit: zoom in to edit the map
+  zoom_in_edit: Zoom in to Edit
   logout: logout
   loading_auth: "Connecting to OpenStreetMap..."
   report_a_bug: report a bug

dist/locales/en.json

@@ -179,7 +179,7 @@
         "localized_translation_language": "Choose language",
         "localized_translation_name": "Name"
     },
-    "zoom_in_edit": "zoom in to edit the map",
+    "zoom_in_edit": "Zoom in to Edit",
     "logout": "logout",
     "loading_auth": "Connecting to OpenStreetMap...",
     "report_a_bug": "report a bug",