[ui:dialog] fix modalize problem with stacked dialog
[cmd:resize] show confirm dialog on save with ENTER key
[cmd:resize] fix problem of two or more resizing dialogs are opened
update Japanese translation
[LANG] add resizeing error messages
Merge branch '2.x' into 2.1

Conflicts:
	js/i18n/elfinder.en.js
	js/i18n/elfinder.jp.js
Merge branch '2.1' into 2.1_n