Merge branch 'master' into translation
Use Flask-Babel for translations. And start tagging strings.
Tag more templates.
Bugfix: add format string to translation variables.
Tag last two templates for translation.
Tag views & forms.
Bugfix: formatting error when using a literal percentage sign.
Add dumps from db for translating certain variables.
Remove timeband on db overview stats.
Bugfix: order of most recent procurements not accurate.
Bugfix: procurement 'added_on' date is set at deploy time and then never re-evaluated.
Merge branch 'translation'