Bug 940907 Re-introduce the Character Encoding menu to the View Source window r=Unfocused

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rename : browser/locales/en-US/chrome/browser/charsetMenu.dtd => toolkit/locales/en-US/chrome/global/charsetMenu.dtd
rename : browser/locales/en-US/chrome/browser/charsetMenu.properties => toolkit/locales/en-US/chrome/global/charsetMenu.properties
rename : browser/modules/CharsetMenu.jsm => toolkit/modules/CharsetMenu.jsm