Drupal 7.x

Hi everyone,

Hope I post in the correct area, I am still learning some basic drupal-fu. Please don't hit me if I'm doing it wrong.

I have a bilingual website set as two different subdomains (fr.domain.com and en.domain.com) and a custom module for content-aware language switcher link in the main menu (i.e. if I'm on fr.domain.com/article-in-french and click on the "English" link I get sent to en.domain.com/same-article-but-in-english).

However, I get the following error on every page :

Drupal 7.65
CKEditor 7.x-1.18

I'm new on Drupal. Sorry form my incompetence.

From the small case studies that I did, I think I understood that for some content any admin user does not see CKEditor.
For other content instead it appears normally.
It does not happen for a particular type of content.

What can I try to do after installing / reinstalling / removed / replaced CKEditor?

Where is the file located where I can change the "Edit summary" next to body? It will be a simple text change, I managed to change it in Google inspect but cannot locate the source. I am currently using it for blog content.

Our site has a blog that is available for public comments.  However, the blog administrator (not me, I'm merely the web developer) wants the site to automatically email a distribution list (made of other distribution lists) when a comment is posted.

Hello.

I'm in charge of the website of my highschool lycee-marchal.com  that was built with Drupal : version 7.65 today, with the theme Mentor

I have a page where the code is :

[[nid:21 view_mode=teaser]]

[[nid:321 view_mode=teaser]]

[[nid:22 view_mode=teaser ]]

[[nid:56 view_mode=teaser]]
and it worked until last week, when I changed, in the second line, the nid 23 into 321. nid 321 is a new page.

I would appreciate some guidance as the best way to capture a visitor's email (them entering it manually) prior to them searching for a distributor via a search by state (from a field in the distributor node).  Ideally it would be just the 2 fields (email address & state) that they have to fill in and it would send an email notification to my sales guys with the email address.  What is the best way to go about this?

Thanks.