1.15.2

New features

[901f826] Allow to translate labels and help messages of form sections (@ktrzos)

Bug fixes

[6340d71] Allow to use FrameworkExtraBundle 2.3 version (@javiereguiluz)
[48b8517] Updated Turkish translation (@slmcncb)
[11bc3df] Updated German and Russian translations (@annaos)
[fb7cf2e] Updated Italian translations (Alberto Di Maio)
[23b2e9a] Avoid the same index multiple times in collections (@rouflak)
[ae25197] Fixed the way image assets are linked in templates (@alborq)
[cf456b6] Improved templates to always include the overridden templates instead of the built-in templates (@javiereguiluz)

Docs

[ac0af03] Added a new tip about dyanmic item actions (@javiereguiluz)
[270ef87] Added missing updatedAt property in the image upload tutorial (@nedelenbos)
[ee83781] Updated FOSUserBundle integration tutorial (@Yunyun548)
[a25f83f] Updated symlink docs for Symfony 3 console command (@shakaran)
[461b143] Fixed wrong title & broken link in config reference (@Pierstoval)
[83e07a6] Updated broken links for AdminController (@shakaran)
[e8c529f] Fixed a minor issue with the short bundle notation in config files (@KhanMaytok)