improve frontend of emacs, ckeditor, tinymce, nicedit, meta and env functions

Improves in emacs:
- use htmx to send content to the controller
- show txt and formatted_txt content in the second panel
- show two tabs if "tabs" winix parameter is used
- add an option to show either one or two panels
- correctly resize the editor window (F11) when two panels are shown

Improves in ckeditor:
- use htmx to send content to the controller
- do not check automatically for ckeditor update

Improves in tinymce/nicedit/meta/env:
- use htmx to send content to the controller

while here:
- change PascalCase to snake_case in meta/env controllers
- update CodeMirror editor to 5.65.16
- udpate Showdown (markdown to html converter) to 2.1.0

winixd/locale/en

@@ -108,8 +108,10 @@ short_url = Short url
 title = Title
 nick = Nick
 change = Change
+change_and_close = Change and close
 edit = Edit
 add = Add
+add_and_close = Add and close
 move = Move
 copy = Copy
 user = User
@@ -127,15 +129,6 @@ rebus_need_to_solve = Solve the rebus please!
 edit_ticket_header = Edit ticket
 create_ticket_header = Create a new ticket
 
-
-
-
-
-ckeditor_update_button = Update
-ckeditor_update_progressbar_img_alt = Progressbar
-
-
-
 form_ticket_type = Ticket type
 form_ticket_status = Status
 form_ticket_priority = Priority
@@ -173,6 +166,9 @@ form_emacs_content_cms = Content
 form_emacs_content_thread = Post
 form_emacs_content_ticket = Info
 
+form_emacs_content_edit = Content
+form_emacs_content_preview = Preview
+
 form_emacs_content_type = Message type
 
 form_emacs_content_type_text = text
@@ -182,6 +178,10 @@ form_emacs_content_type_bbcode = bbcode
 form_emacs_content_type_other = other \(no formatting\)
 form_emacs_content_type_markdown = markdown
 
+form_emacs_view_type = View
+form_emacs_view_type_one_panel = One panel
+form_emacs_view_type_two_panels = Two panels
+
 
 last_header = Last logged users
 last_tab_login = Login
@@ -355,8 +355,6 @@ upload_button_download = Download
 upload_button_edit = Edit
 upload_error = Error:
 upload_processing = Processing...
-upload_content_edit = Content
-upload_content_preview = Preview
 
 
 who_header = Sessions
@@ -508,10 +506,6 @@ stat_template_from_mount_point = from the mount point
 
 subject_header = Edit subject
 
-
-tinymce_update_button = Update
-tinymce_update_progressbar_img_alt = Progressbar
-
 uname_header = System
 uname_components = Components
 uname_available_plugins = Plugins