Bug 1432555 - Restore and use existing string extensionControlled.enable for instruction on how to enable extensions r=Gijs

MozReview-Commit-ID: 4nGtBhWzakN

--HG--
extra : rebase_source : aabca46e1d06c84cc55f33335dd13cb1ab7dc0a4

browser/components/preferences/in-content/preferences.js

@@ -547,7 +547,7 @@ function showEnableExtensionMessage(settingName) {
   let addonIcon = icon("chrome://mozapps/skin/extensions/extensionGeneric-16.svg");
   let toolbarIcon = icon("chrome://browser/skin/menu.svg");
   let message = document.getElementById("bundlePreferences")
-                        .getString("extensionControlled.enable2");
+                        .getString("extensionControlled.enable");
   let frag = BrowserUtils.getLocalizedFragment(document, message, addonIcon, toolbarIcon);
   elements.description.innerHTML = "";
   elements.description.appendChild(frag);

browser/locales/en-US/chrome/browser/preferences/preferences.properties

@@ -302,4 +302,4 @@ extensionControlled.websites.trackingProtectionMode = An extension, %S, is contr
 # %1$S is replaced with the icon for the add-ons menu.
 # %2$S is replaced with the icon for the toolbar menu.
 # This string is shown to notify the user how to enable an extension that they disabled.
-extensionControlled.enable2 = To enable the extension go to %1$S Add-ons in the %2$S menu.
+extensionControlled.enable = To enable the extension go to %1$S Add-ons in the %2$S menu.