Provide "last changed" info

A problem for admins of a community driven translation server is that they may not always be aware that a translation of a certain project has changed. If there was a way of knowing when a string for a language/project was last added or changed, we could compare this to the date when the translation was last committed to cvs.

I suggest an extra column on the project overview page: translate/projects/{project}. Something along these lines:

Just as important as the dates though, is that we need to change the module to use ascii art and monospace fonts for all layout, as shown above. (Leaving priority at Normal for now.)