PIM-3073 : add missing translation keys
Merge pull request #1655 from akeneo/PIM-3073-add-missing-translation-keys

PIM-3073 : add missing translation keys
PIM-3278 : Create a simpler user grid view
PIM-3278 : Create a simpler role grid view
PIM-3278 : Create a simpler user group grid view
PIM-3278 : Override user group update view (to prepare grid change)
PIM-3278 : Copy user grid to prepare refactoring
PIM-3278 : Copy role grid to prepare refactoring
PIM-3278 : Copy user group grid to prepare refactoring
PIM-3278 : Copy role users grid and listeners to prepare refactoring
PIM-3278 : Copy group users grid and listeners to prepare refactoring