Update pw-change.html, register.html, submit.html

Some images are no longer used but they still exist here for the time
being. Text is used instead though based on some discussion text might
have to change.

Adjusted alt text of some images a bit.

A more thorough look at the way these updates look must still be done.

next/pw-change.html

@@ -448,25 +448,27 @@ given. Click “Login”.</p>
 you will be required to change your password. Assuming everything is fine, that
 would look something like:</p>
 <p><img src="../png/submit.first-login.png"
- alt="submit server password change required"
+ alt="submit server initial login requires your password to be changed"
  width=710 height=808></p>
 <p>As you can see, on your first login you <strong>MUST</strong> change your password. If you do
 not do this within 72 hours <strong>YOUR ACCOUNT WILL BE CLOSED</strong> and you’ll have to
-register again!</p>
-<p>Put in your login (UUID username), your old (initial) password and a new password.</p>
-<p>Click “Change Password”.</p>
-<p><strong>NOTE</strong>: If enter an improper new password, you will see an error message
-that looks similar to this:</p>
-<p><img src="../png/submit.invalid-passwd.png"
- alt="submit server password change error"
- width=710 height=808></p>
-<p>If that happens, choose a proper new password and try again.</p>
-<p>Once you’ve changed your password you will be able to log in again with your UUID
-username and new password. This is what it will look like when you change your
-password:</p>
-<p><img src="../png/submit.passwd-changed.png"
- alt="submit server password changed"
- width=710 height=344></p>
+register again! In that case, it will say something like this:</p>
+<blockquote>
+<p>ERROR: Sorry (tm Canada 🇨) you cannot login at this time.</p>
+</blockquote>
+<p>Assuming you did login in time, you should put in your login (UUID username),
+your old (initial) password and a new password and then click “Change Password”.</p>
+<p><strong>NOTE</strong>: if you have put in your old password, you’ll get the following error:</p>
+<blockquote>
+<p>ERROR: Password not changed<br>
+ERROR: invalid old password</p>
+</blockquote>
+<p>Once you’ve changed your password successfully you will be able to log in again
+with your UUID username and new password. When you have done this it will
+report:</p>
+<blockquote>
+<p>• Password successfully changed.</p>
+</blockquote>
 <p>When the contest is <a href="../faq.html#open">open</a>, proceed with
 <a href="../quick-start.html#step_5">Step 5: Obtain and compile the latest mkiocccentry toolkit</a>.</p>
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