PIM-3336: split title and subtitle
Merge pull request #1790 from akeneo/PIM-3336-split

PIM-3336: split title and subtitle
Revert "PIM-3336 Compact the product edit page header on lower resolutions"
Merge pull request #1806 from akeneo/revert-1774-PIM-3336

Revert "PIM-3336 Compact the product edit page header on lower resolutio...
PIM-3319: Added value check for filters and specs
PIM-3319: Fix exceptions and specs + refactor some code
PIM-3319: Fixed some typos in the use of exceptions
PIM-3319: removed unused methods
PIM-3319: Update the changelog
PIM-3319: Fix behat