Fix #1158 : Remove `required` attributes on non-required attributes in Order creation
Fix #1169 : Disable preview keyboard shortcut while download window open
Fix #1152 : On upload, require subdefinitions creation when files have been totally copied
Fix #1156 : Move mime detection hack to application level
Fix #1160 : Fix advanced search collection list
Fix #1164 : Grouped status bit in advanced search options are not displayed correctly
Update locales
Prepare version 3.7.12
Merge pull request #346 from romainneutron/v3.7.12

[3.7] 3.7.12