[IMP] base_import: update select2 lib to revision 3.4.5
[IMP] select2: allow translation of information messages, avoid the need of locale files from select2
[IMP] will add bootstrap style once needed
[FIX] base_import: update the select2 library up to version 3.4.5

This fixes rendering issue in firefox (mouseover bar chart in dashbord view)
Replace the new localisation of select2 by our translation system