Polished on side-loaded extension install alert.

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 df00d729bfc95ec602e3357e803fdb39af9a0a16..f347ed4ad3f334c52051be0dd4235f714a383de1 100644
--- a/chrome/app/chromium_strings.grd
+++ b/chrome/app/chromium_strings.grd
@@ -603,13 +603,14 @@ Chromium is unable to recover your settings.
 
       <!-- Extension alerts. -->
       <message name="IDS_EXTENSION_ALERT_ITEM_EXTERNAL" desc="A statement that an external extension has been newly installed. End users have no idea what an 'external' extension is, so we simply call them extensions.">
-The extension "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>" has been added to Chromium.
+The extension "<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.">
-        <ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph> has been added to Chromium.
+        <ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph> has been added.

[chebert, 2012/02/23 23:40:18]

Why did you do this here, but not in the google_chrome_strings.grd? Make a
decision but be consistent.

       </message>
 
       <!-- chrome://settings/extensions page -->