fixes template changes now that we don't use jinja

This commit fixes and improves a few things for the jinja removal.
* static urls can be constructed via the _static_ templatetag rather than being manually constructed
* words can be pluralized with the _pluralize_ templatetag
* comments use the _comment_ and _endcomment_ block
* django _settings_ has been is added back to the base context processor becuase its removal caused continual redirects to the home page due to continual requests being made to the browserid login.