More string tweaks from madhava [r=ui]

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

@@ -135,7 +135,7 @@ tabs.closeWarningPromptMe=Warn me when I attempt to close multiple tabs
 # LOCALIZATION NOTE: homepage.custom is the text displayed on the selector button if
 # the user selects a webpage to be the startpage. We can't display the entire URL
 # or webpage title on the menulist, so we just display "Custom"
-homepage.custom=Custom
+homepage.custom=Custom Page
 
 # Page Actions
 pageactions.saveas.pdf=Save As PDF

mobile/locales/en-US/chrome/preferences.dtd

@@ -15,7 +15,6 @@
 <!ENTITY defaultBrowser.title                      "Default Browser">
 <!ENTITY defaultBrowser.description                "Make &brandShortName; your default browser">
 <!ENTITY homepage.title                            "Start page">
-<!ENTITY homepage.none                             "Blank">
+<!ENTITY homepage.none                             "Blank Page">
 <!ENTITY homepage.default                          "&brandShortName; Start">
 <!ENTITY homepage.currentpage                      "Use Current Page">
-<!ENTITY homepage.custom                           "Custom Page">