Add/sort locales

Added new languages and reoredered by language codes.
Hungarian language file updated

New lines added by the latest English language file.
A delay added to CMS side menu tab change event to avoid the annoying unexpected menu changes while moving mouse arround
Fix 'File was changed' modal so 'Reload' and 'Save' buttons actually work.
Delete all selected related elements and not just the first element
Merge pull request #765 from jtherczeg/patch-1

Add/sort locales
Merge pull request #766 from jtherczeg/patch-2

Hungarian language file updated
Merge pull request #767 from ImanMh/master

A delay added to CMS side menu tab change event to avoid the annoying tab changes
Merge pull request #768 from danherd/develop

Fix 'File was changed' modal
Merge pull request #770 from nicolas-lescop/patch-2

Delete all selected related elements and not just the first element
Adds a way to get the form model after the action has executed
Streamline Theme object API (::load should be static as in CmsObject)
Pass mtime to menu resolving method results
Added new symbols to page slug regexp in the backend.
Example slug:
/news/:page?|^[0-9]+$ - "/news/", "/news/2"
Merge pull request #782 from webmaxx/develop

Added new symbols to page slug regexp in the backend.
Fixes #783 - Logic error
Merge branch 'master' of https://github.com/octobercms/october