Remove broken web links from About Box

Removed broken links for "Silk Icon Set" and "16x16 Free Application
Icons" attributions.

Added <span> tags with title "broken link removed" to relevant
attributions.

Author: delphidabbler

Src/Res/HTML/dlg-about-program-tplt.html

@@ -77,30 +77,27 @@
         </li>
         <li>
           <div>
-            <em>CodeSnip</em> makes use of images from the following icon
+            <em>CodeSnip</em> makes use of images from the following image
             collections:
           </div>
           <ul>
             <li>
-              <a
-                href="http://www.famfamfam.com/lab/icons/silk/"
-                class="external-link"
-              >Silk Icon Set 1.3</a> by Mark James.
+              <span title="broken link removed">Silk Icon Set 1.3</span> by Mark
+              James.
             </li>
             <li>
-              Silk Companion 1 by Damien Guard.
+              <span title="broken link removed">Silk Companion 1</span> by Damien
+              Guard.
             </li>
             <li>
-              Led Icon Set v1.0.
+              <span title="broken link removed">Led Icon Set v1.0</span>.
             </li>
             <li>
-              16x16-free-application-icons by <a
-                href="https://www.aha-soft.com"
-                class="external-link"
-              >Aha-Soft</a>.
+              <span title="broken link removed">16&times;16 Free Application
+              Icons</span> by Aha-Soft.
             </li>
             <li>
-              PixelBox icon collection.
+              <span title="broken link removed">PixelBox icon collection</span>.
             </li>
             <li>
               <a