This scares me.  Not only are we including markup in here, we're doing templated markup.  A translator has to know what to do with `href='{{lang}}/...`.  I'd be interested to get feedback from others here, since I understand why you've done it /cc @jbuck, @Pomax.  If we break up the string into multiple parts, such that the html/template stuff can be external, we run the risk that the sentence isn't easily translatable any more (e.g., word boundaries might not make sense in other languages).