3.1.8

New features

[14e2c6b] Allow to render HTML in ChoiceField options (@alexis78-sym)
[a1d8c1d] Display flags in country dropdowns (@javiereguiluz)
[a23e440][f573c76] Added support to use callable formats in routing configuration (@edefimov)
[fd3dbf8] Allow to upload/remove images in Image fields (@javiereguiluz)

Bug fixes

[900df55] Fixed "allowClear" when no "placeholder" is set in AssociationField (@liarco)
[ea43d1c] Fixed a bug with autogrow textareas in minimized panels (@quentint)
[8bad261] Fixed the default behavior of content/sidebar width (@malteschlueter)
[aa49ff9] Fixed the autocomplete feature of association fields (@javiereguiluz)