Remove 'failed-again' (#16128)

It was not implement by Mike but let's not bother with this added
complexity.

wiki/src/install/inc/js/download-2.js

@@ -113,9 +113,6 @@ document.addEventListener("DOMContentLoaded", function() {
       toggleDisplay(document.getElementsByClassName("use-mirror-pool-on-retry"), "show");
       replaceUrlPrefixWithRandomMirror(document.querySelectorAll(".use-mirror-pool-on-retry"));
     }
-    else if (result === "failed-again") {
-      show(document.getElementById("verification-failed-again"));
-    }
     else if (result === "error-file") {
       show(document.getElementById("verification-error-file"));
     }
@@ -133,7 +130,6 @@ document.addEventListener("DOMContentLoaded", function() {
     hide(document.getElementById("verifying-download"));
     hide(document.getElementById("verification-successful"));
     hide(document.getElementById("verification-failed"));
-    hide(document.getElementById("verification-failed-again"));
     hide(document.getElementById("verification-error-file"));
     hide(document.getElementById("verification-error-json"));
     hide(document.getElementById("verification-error-image"));
@@ -313,7 +309,6 @@ document.addEventListener("DOMContentLoaded", function() {
   // showVerificationProgress("50");
   // showVerificationResult("successful");
   // showVerificationResult("failed");
-  // showVerificationResult("failed-again");
   // showVerificationResult("error-json");
   // showVerificationResult("error-image");
   // verifyFile(null, null);

wiki/src/install/inc/steps/download.inline.html

@@ -120,7 +120,8 @@ were solved, and known issues that have already been identified.</p>
       a network attack in your country or local network.</p>
 
       <p>Downloading again is usually enough to fix this
-      problem.</p>
+      problem. Otherwise, please try downloading from a different place or a
+      different computer.</p>
 
       <p>[[How does the verification work?|contribute/design/download_verification]]</p>
       """]]
@@ -128,23 +129,6 @@ were solved, and known issues that have already been identified.</p>
       <p class="usb upgrade download-only-img"><a href="[[!inline pages="inc/stable_amd64_img_url" raw="yes" sort="age"]]" id="download-img-again" class="use-mirror-pool-on-retry">Please try to download again&hellip;</a></p>
       <p class="dvd vm download-only-iso"><a href="[[!inline pages="inc/stable_amd64_iso_url" raw="yes" sort="age"]]" id="download-iso-again" class="use-mirror-pool-on-retry">Please try to download again&hellip;</a></p>
     </div>
-    <div id="verification-failed-again" class="block">
-      <p>[[!img lib/cross.png class="icon" link="no" alt=""]]<b>Verification failed again!</b></p>
-      <p class="floating-toggleable-link why-failed-again-link">[[!toggle id="why-failed-again" text="Why?"]]</p>
-      <div id="why-failed-again" class="floating-toggleable">
-      [[!toggleable id="why-failed-again" text="""
-      [[!toggle id="why-failed-again" text="X"]]
-      <p>The verification might have failed again because of:</p>
-      <ul>
-        <li>A software problem in our verification code</li>
-        <li>A malicious download from our download mirrors</li>
-        <li>A network attack in your country or local network</li>
-      </ul>
-      <p>Trying from a different place or a different computer might solve any of these issues.</p>
-      """]]
-      </div>
-      <p>Please try to download again from a different place or a different computer&hellip;</p>
-    </div>
     <div id="verification-error-file" class="block">
       <p>[[!img lib/cross.png class="icon" link="no" alt=""]]<b>Error selecting image.</b></p>
       <p class="usb upgrade download-only-img">Make sure that you select a USB image that is readable by your browser.</p>

wiki/src/install/inc/stylesheets/download.css

@@ -17,7 +17,6 @@
 #verifying-download,
 #verification-successful,
 #verification-failed,
-#verification-failed-again,
 #verification-error-file,
 #verification-error-json,
 #verification-error-image,
@@ -107,11 +106,11 @@ span.step-number {
   top: 5px;
 }
 
-#javascript-verification-tip, #verification-failed, #verification-failed-again {
+#javascript-verification-tip, #verification-failed {
   position: relative;
 }
 
-.why-verify-link, .why-failed-link, .why-failed-again-link {
+.why-verify-link, .why-failed-link {
   position: absolute;
   top: 0;
   left: 35em;