Hello.
I took advantage of your recommendation, checked everything with the joomla debugger. Found some errors in zoo but this did not help to solve the problem.

But he drew attention to the display of navigation elements in chrome. I enclose illustrations. When setting the localization, a problem appears, when uninstalling, it disappears.
And so every time. I tried different language packs. He even tried to assemble his own localization.

The situation is applicable to all buttons: save, save and close, cancel

Thanks for the help

Well, I am not alone ! The only solution I have found is to uninstall the language pack each time I need to change the K2 content module. Then I reinstall the language pack.

Anyway, I manage at least to migrate a first new version of my website to the server.

I have several errors with K2. But my IT skills are quite low.

I will try in a further post to give you the error I get.

I tried all the language packs ru-RU and uk-UA
The result is the same.

For my part, it was : k2_fr-FR_language_pack

I am going to be crazy... Now, even if I uninstall the language pack, I am stuck... I cannot save or close.

According to the dev console, I have the following error:
SyntaxError: unexpected token: identifier index.php:258:65

When I click on index.php:258:65, it reverts to the following part of code (I manually add line 258 for your identification):

jQuery(function($){ initPopovers(); $("body").on("subform-row-add", initPopovers); function initPopovers (event, container) { $(container || document).find(".hasPopover").popover({"html": true,"trigger": "hover focus","container": "body"});} });
jQuery(function($){ $("#myTab a").click(function (e) {e.preventDefault();$(this).tab("show");});});
jQuery(function($){ $("#myTabTabs").append($("<li class=\" active\"><a href=\"#general\" data-toggle=\"tab\">Module<\/a><\/li>")); });

// Set K2 version as global JS variable
K2JVersion = '30';

// Set Joomla version as class in the 'html' tag
(function(){
var addedClass = 'isJ30 k2ViewIsModule k2IsBackend';
if (document.getElementsByTagName('html')[0].className !== '') {
document.getElementsByTagName('html')[0].className += ' '+addedClass;
} else {
document.getElementsByTagName('html')[0].className = addedClass;
}
})();

// K2 Language Strings
line 258: var K2_THE_ENTRY_IS_ALREADY_IN_THE_LIST = 'L'entrée \'ENTRY_NAME_HERE\' est déjà dans la liste !';
var K2_REMOVE_THIS_ENTRY = 'Cliquez pour supprimer cette entrée';
var K2_THE_ENTRY_WAS_ADDED_IN_THE_LIST = 'L'entrée \'ENTRY_NAME_HERE\' a été ajoutée à la liste.';


I hope that we will be able to find a solution !

Kind regards

Checked, everything works.

Thanks for the help.

Thank you Fotis : it works !!!

I have now an issue with the display of my blog, which did not exist with the stable version.

www.champion-avocats.com/blog-conseil-avocats

The display of the list of categories, last articles and search bar is not on the right, but on the bottom... I do not understand why, because it works before.

Is it a bug from the dev version or not ?

Kind regards