MD Settings: Unify multiple copies of the "edit" string to a single IDS_SETTINGS_EDIT.

chrome/browser/resources/settings/search_engines_page/search_engine_entry.html

 <link rel="import" href="chrome://resources/cr_elements/cr_action_menu/cr_action_menu.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="../controls/extension_controlled_indicator.html">
 <link rel="import" href="search_engine_dialog.html">
 <link rel="import" href="search_engine_entry_css.html">
 <link rel="import" href="search_engines_browser_proxy.html">
 <link rel="import" href="../settings_shared_css.html">
@@ skipping 44 matching lines @@
       <paper-icon-button icon="cr:more-vert" tabindex$="[[tabindex]]"
           on-tap="onDotsTap_">
       </paper-icon-button>
       <dialog is="cr-action-menu">
         <button class="dropdown-item" role="option" on-tap="onMakeDefaultTap_"
             hidden$="[[!engine.canBeDefault]]" id="makeDefault">
           $i18n{searchEnginesMakeDefault}
         </button>
         <button class="dropdown-item" role="option" on-tap="onEditTap_"
             hidden$="[[!engine.canBeEdited]]"
-            id="edit">$i18n{searchEnginesEdit}</button>
+            id="edit">$i18n{edit}</button>
         <button class="dropdown-item" role="option" on-tap="onDeleteTap_"
             hidden$="[[!engine.canBeRemoved]]"
             id="delete">$i18n{searchEnginesRemoveFromList}</button>
       </dialog>
     </div>
     <template is="dom-if" if="[[engine.extension]]">
       <extension-controlled-indicator
           extension-id="[[engine.extension.id]]"
           extension-name="[[engine.extension.name]]"
           extension-can-be-disabled="[[engine.extension.canBeDisabled]]">
       </extension-controlled-indicator>
     </template>
   </template>
   <script src="search_engine_entry.js"></script>
 </dom-module>