PIM-1571 Compare and copy translated values

```
Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Unit test passes: yes
Behat scenarios passes: no
Checkstyle issues: no
ChangeLog updated: yes
Documentation PR:
Fixes the following jira:
 - PIM-1571
 - PIM-820
```
  - [x] Split headers in two and place "Add attribute" and "Eye" button on the left, and "Copy", "Translate : ..." and "X" button on the right
  - [x] Hide translation field labels (or translate them into their locale)
  - [x] Copy all translations value to the left
  - [x] Copy selected translations value to the left
  - [x] Copy metric unit
  - [x] Copy file attribute
  - [x] Copy yes/no value