Have different text for apps and regular extensions in some more places.

chrome/app/google_chrome_strings.grd

Index: chrome/app/google_chrome_strings.grd
diff --git a/chrome/app/google_chrome_strings.grd b/chrome/app/google_chrome_strings.grd
index 0e485fc2a7b915ac0a645beaaff6d0e906dbbd88..a9ec4fa25e3b5762eedab2b46a13237f8d6c467a 100644
--- a/chrome/app/google_chrome_strings.grd
+++ b/chrome/app/google_chrome_strings.grd
@@ -615,6 +615,11 @@ The extension "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>" has been
 
 '''
       </message>
+      <message name="IDS_APP_ALERT_ITEM_EXTERNAL" desc="A statement that an external packaged app has been newly installed. End users have no idea what an 'external' app is, so we simply call them apps. The trailing character must be a newline.">
+The app "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>" has been added.

[sky, 2012/09/11 17:37:23]

This doesn't mention chrome, any reason to have it in google_chrome_strings.grd?

[Marijn Kruisselbrink, 2012/09/11 18:03:38]

The reason I put it here is because IDS_EXTENSION_ALERT_ITEM_EXTERNAL is here
too. That one used to refer to chrome until r124874 removed it. Maybe that means
both of these shouldn't be in here

[sky, 2012/09/11 18:16:46]

I believe that's right; remove both.

[Marijn Kruisselbrink, 2012/09/13 17:31:24]

Done.

+
+'''
+      </message>
 
       <!-- Extension installed bubble -->
       <message name="IDS_EXTENSION_INSTALLED_HEADING" desc="First line in the content area of the extension installed bubble. Instructs that the extension was installed.">