PIM-1357 : Tooltip containing description is missing

Tooltip containing description is missing for the field "axis" in the popin of creation of a variant group.

Bug fix: [no]
Feature addition: [yes]
Backwards compatibility break: [no]
Unit test passes: [yes]
Behat scenarios passes: [yes]
Checkstyle issues: [no]*
Fixes the following jira:
 - PIM-1357