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

chrome/app/chromium_strings.grd

Index: chrome/app/chromium_strings.grd
diff --git a/chrome/app/chromium_strings.grd b/chrome/app/chromium_strings.grd
index 6b44b1ef135ab6b311093a9cedca01247f11502b..4cca4cc142eef690dc119a9a31d032d9dc290ab0 100644
--- a/chrome/app/chromium_strings.grd
+++ b/chrome/app/chromium_strings.grd
@@ -691,6 +691,11 @@ 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.">

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

Any reason for forcing the newline in these messages?

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

Because the code that uses these potentially concatenates several of these
strings for multiple extensions/apps, and they should all end up on their own
line. Maybe it would indeed be better to change that code to add the newline
there instead of having the newline in all of the strings that can be used
there.

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

Yes, I think that would be less error prone.

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

Done.

+The app "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>" has been added.
+
+'''
+      </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.">