Bug 593535 - Failure to download extension causes about:addons to list the addon with no way to restart the download (strings only); r=dtownsend, a=blocks-beta7

toolkit/locales/en-US/chrome/mozapps/extensions/extensions.properties

@@ -36,6 +36,14 @@ notification.install=%1$S will be installed after you restart %2$S.
 notification.uninstall=%1$S will be uninstalled after you restart %2$S.
 #LOCALIZATION NOTE (notification.upgrade) %1$S is the add-on name, %2$S is brand name
 notification.upgrade=%1$S will be updated after you restart %2$S.
+#LOCALIZATION NOTE (notification.downloadError) %1$S is the add-on name. Not yet implemented - see https://bug593535.bugzilla.mozilla.org/attachment.cgi?id=475403
+notification.downloadError=There was an error downloading %1$S.
+notification.downloadError.retry=Try again
+notification.downloadError.retry.tooltip=Try downloading this add-on again
+#LOCALIZATION NOTE (notification.installError) %1$S is the add-on name. Not yet implemented - see https://bug593535.bugzilla.mozilla.org/attachment.cgi?id=475403
+notification.installError=There was an error installing %1$S.
+notification.installError.retry=Try again
+notification.installError.retry.tooltip=Try downloading and installing this add-on again
 
 #LOCALIZATION NOTE (contributionAmount) %S is the currency amount recommended for contributions
 contributionAmount=Suggested Donation: %S