Quick fix to enable yaki-tng to run 'out of the box'

Hi There,
I realise this is a work in progress, but I was curious and wanted to have a look. Unfortunately there was a niggly issue around localisations that prevented yaki-tng running out of the box. This fix addresses this buy running a one-time-only build of the localisation PO files using the now-included msgfmt.py

My Python is weak, but this fix works (I think). I suspect you have a better way to approach this, so feel free to ignore this pull request. In either case, I hope it is clear what the problem is and how I have worked around it.  

I assume you have valid compiled MO files on your system (so this issue would not arise), but I note that they are .gitignore-ed. Possibly for good reason?