Proposed title:

Why:

-       JHtml::_('behavior.modal', 'a.modal_jform_contenthistory');
-
+       JHtml::_('bootstrap.modal');
+
+       $lang = JFactory::getLanguage();
+       $extension = 'com_contenthistory';
+       $base_dir = JFactory::getApplication()->isAdmin() ? JPATH_ADMINISTRATOR : JPATH_SITE;
+       $language_tag = $lang->getName();
+       $reload = true;
+       $lang->load($extension, $base_dir, $language_tag, $reload);

which is anyway wrong as you should use $lang->getTag(); instead of $lang->getName();

Hmm, found out that we indeed have to reload language to get the modal title translated.
Not sure we need to check the $app and else as anyway the language file is only in admin
so we only need:

$lang = JFactory::getLanguage();
$lang->load('com_contenthistory', JPATH_ADMINISTRATOR, $lang->getTag(), true);

@dgt41 I am not guru, and for me jQuery("#userModal").modal("hide”); is good

another notice:
you use JHtmlBootstrap::renderModal
but better do it in Joomla! way JHtml::_('bootstrap.renderModal', $selector, $params , $footer)
example your:

JHtmlBootstrap::renderModal('versionsModal', array( 'url' => $link, 'title' => $label ,'height' => '600px', 'width' => '800px'), '');

will become:

JHtml::_('bootstrap.renderModal',  'versionsModal', array( 'url' => $link, 'title' => $label ,'height' => '600px', 'width' => '800px'));

@test

This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/4561.

@tested Succesfully

This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/4561.

moving to RTC as we have more that 2 successful tests

moving to RTC as we have more than 2 successful tests

The PRs regarding Media Field, User Field and Content History are also used in the front end. That might break the rendered design IF THE TEMPLATE is not BOOTSTRAP compatible. (the old modal uses it’s own css file). I wrote it!

For B/C I reverted the option to use the mootools modal in front end. Lets NOT break every site out there.
Please test again

Will try again when #3231 is committed