Tweaking wording.

browser/base/locale/browser.properties

@@ -40,10 +40,6 @@ linkHREFLabel=Location:
 #SessionHistory.js
 nothingAvailable=(Nothing Available)
 
-#navigator.js
-oldthemetitle=Warning: incompatible theme
-oldTheme=You have selected a theme which was designed for an earlier version of %brand% and is incompatible with your current %brand% version. Please check the %brand% Theme Park for an updated version of the theme. You can uninstall this theme by clicking \"OK\" button.
-
 # Localization Note: Use 'true' or 'false' to control the pref:theme to 
 # show the English description or not
 # for example, in Japanese build, instead of showing English description