webui: display messages contained in API responses

API responses can contain warnings in "messages" array. This patch
also adds support for displaying multiple notifications at the same
time in order to show the message and a status of finished operation.

Reviewed-By: Petr Spacek <pspacek@redhat.com>
Update translations

Pull new translations from Transifex
Thanks to all translators!
Become IPA 4.0.0
Fix ipa-client-install --uninstall crash

Fix ipa-client-install crash when chronyd service fails to start.

https://fedorahosted.org/freeipa/ticket/4273

Reviewed-By: Petr Viktorin <pviktori@redhat.com>
webui: capitalize labels of undo and undo all buttons

Make the label of these buttons consistent with other buttons which have
capital first letters.

Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>