Do not use verb "Install" for things other than turning on modules/themes

Looks like a great start, thanks! A few initial concerns looking at the patch:

1. +++ b/core/modules/system/src/Controller/DbUpdateController.php
   @@ -212,17 +212,17 @@ protected function info(Request $request) {
   -    $info[] = $this->t("<strong>Back up your code</strong>. Hint: when backing up module code, do not leave that backup in the 'modules' or 'sites/*/modules' directories as this may confuse Drupal's auto-discovery mechanism.");
   +    $info[] = $this->t("<strong>Back up your files</strong>. Hint: do not leave a backup of software files under the 'modules', 'sites/*/modules', 'themes', 'sites/*/themes', or 'profiles' directories as this may confuse Drupal's auto-discovery mechanism.");
   

   A) Seems out of scope from the rest of these changes.

   B) Not sure I agree that "files" is better than "code" here. In the UI and Drupal generally, we tend to use "files" to refer to the uploaded files (e.g. sites/default/files) dir.

   C) Does 9.2.x even look at sites/*/modules anymore?

2. +++ b/core/modules/system/src/Controller/DbUpdateController.php
   @@ -212,17 +212,17 @@ protected function info(Request $request) {
   +    $info[] = $this->t('Update the files for Drupal core, your install profile, modules, and/or themes (as described in the above-linked handbook).');
   

   A) Do we really want to spell out "core, your install profile, modules, and/or themes"? Is "install profile" confusing in this context? ;)

   B) "above-linked handbook" seems a little awkward. How about:

   "... (as described in the handbook page linked above)."?

3. +++ b/core/modules/update/update.install
   @@ -128,7 +128,7 @@ function _update_requirement_check($project, $type) {
   -        $requirement['description'][] = ['#prefix' => ' ', '#markup' => t('See the <a href=":available_updates">available updates</a> page for more information and to install your missing updates.', [':available_updates' => Url::fromRoute('update.report_update')->toString()])];
   +        $requirement['description'][] = ['#prefix' => ' ', '#markup' => t('See the <a href=":available_updates">available updates</a> page for more information and to update your software.', [':available_updates' => Url::fromRoute('update.report_update')->toString()])];
   

   Ahh, so much better. Thanks! 👍

Meanwhile I grepped the code for 'install' and lo, it's nearly 10K lines. ;) So, yeah, I'm not going to try to go through that to see if we missed anything. I'd be in favor of wrapping this up and getting it in, moving through the rest of the current plan, and if/when we find any other spots we missed, to deal with them in separate follow-ups. Let's not let perfect be the enemy of good.

Thanks!
-Derek

Took a look at #5 and all makes sense to me

Rerolled for 9.5.x

The Needs Review Queue Bot tested this issue. It either no longer applies to Drupal core, or fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

Apart from a re-roll or rebase, this issue may need more work to address feedback in the issue or MR comments. To progress an issue, incorporate this feedback as part of the process of updating the issue. This helps other contributors to know what is outstanding.

Consult the Drupal Contributor Guide to find step-by-step guides for working with issues.

Re-rolled #9

Just FYI to help get the message out there.

Starting March 2023, simple rerolls, rebases, or merges will no longer receive issue credit. Only rerolls that address a merge conflict will be credited, and the merge conflict that was resolved must be documented in the text of an issue comment.
To receive credit for contributing to this issue, assist with other outstanding tasks or unaddressed feedback.
See the issue credit guidelines for more information.

So would need to post how the patch no longer applies to 10.1

Did a search on phpstorm for "install modules" and the results

Which seem to refer to actually installing a module. Think this is good (though hard to fully serach)

Updating issue credits

Committed to 10.1.x, not backporting because of the string changes