Convert title text to title case for EN only.

Adding "The" to the title broke l10n. However, we did have the string "The Web
we want" fully translated. It was decided to convert the EN string back to
title case automatically to avoid breaking l10n. I added a filter that allows
us to do this for any languages we choose.

@jgmize r?
@flodolo @pascalchevrel this should fix it.