Module development and code questions

I'm maintaining a new contributed module, Bootstrap Theme Toggler, and am having a problem with it failing a PHPUnit functional test that I've defined and included in the project.

Hello,

I want to run an ajax form, which is loaded itself (only the HTML) via ajax in jQuery

I load a form into a page in a boostrap modal using the following code called on Ajax (with a custom route) :

I maintain the amazon_pa module and now tried to upgrade to D10.

The problem is that the comoser repository uses guzzle 6.2 and that will throw the following error.

How can I change text of "create taxonomy term" button?

This is node reference field for taxonomy, appears when I click Add new taxonomy term when add or edit a node.

My objective: create a page.html.twig override for Vcabularies.

Intention: So that term page displays under each vocabulary looks different.

The code I am tryng to use in my themename.theme is this:

use Drupal\taxonomy\Entity\Term;

I'd like to add in the name field from an entityform to a mailchimp list via the mailchimp automation module, but I'm not sure how to code this.