fixed hidden iframes
news file
bump version 3.1.12
dist files 3.1.12
Merge branch 'release/3.1.12' into develop
bumto dev version 3.1.13-dev
Merge branch 'develop' into CDB-293_title_in_legends

* develop:
  bumto dev version 3.1.13-dev
  dist files 3.1.12
  bump version 3.1.12
  news file
  fixed hidden iframes