Merge pull request #29 from openfun/jpaille/issue959-add-test-certificate-generation

#982: change Ink css to allow preprocess by djangostaticfiles and remove useless static files from backoffice application
issue959 add message error when univerisity is not found
issue959 change error message to warning
issue959 replace double quotes by single quote
#982 i18n
issue959 fix unicode bug
#1023 missing i18n
issue959 add one teacher/title field
issue959 refactoring commit