Fix form/date_time helper
Improve ajax call to build composer page url slug

* Disable form submission until the ajax request has finished
* Don't do ajax request if page name is the same as the previous ajax
  request
* Take in account the ajax response (success of fail) only if it's for the
  last ajax request
Fix multi-language settings for tinyMCE

I need these.
Please...
Fix uID override while editing guestbook entry.
Prevent entryDate update while editing guestbook entry.
get language list in l10n library
show system errors in case someone uses view.php for their login, register.. page
Catch unsupported locales
make variadic sortByMultiple function callable by variable
updated
missing )
hmm
Patch current Chosen with some code from 0.9.9

Let's add support for the these options:
# placeholder_text_multiple: defaults to "Select Some Options"
# placeholder_text_single: defaults to "Select an Option"

These options are the same of newer version of Chosen: if we'll upgrade
Chosen we won't have to patch it again.
Translate some strings for Chosen

Introduce a new ccmi18n_chosen JavaScript object that contains translated
strings for Chosen (it can be used as the option parameter when
instantiating Chosen).
Add a description to a translatable text
Localize Chosen in File manager
Localize Chosen in Search Users
Localize Chosen in Bulk Group Add
Localize Chosen in Bulk Group Remove
Fix tinymce lang file path to define EDITOR_LANGUAGE