Add titles to footer icons.

layouts/partials/categories.html

@@ -1,7 +1,7 @@
 {{ with .Params.categories }}
     <p>
         <img style="display: inline-block; vertical-align: middle; margin-right: 4px;"
-            src="/feathericons/16px-a9a9b3/folder.svg" alt="Categories:"
+            src="/feathericons/16px-a9a9b3/folder.svg" alt="Categories:" title="Categories"
         >
         {{ range . -}}
             {{ if (not (eq . "pinned")) }}

layouts/partials/series.html

@@ -1,7 +1,7 @@
 {{ with .Params.series }}
     <p>
         <img style="display: inline-block; vertical-align: middle; margin-right: 4px;"
-            src="/feathericons/16px-a9a9b3/tv.svg" alt="Series:"
+            src="/feathericons/16px-a9a9b3/tv.svg" alt="Series:" title="Series"
         >
         {{ range . -}}
             {{ if (not (eq . "pinned")) }}

layouts/partials/tags.html

@@ -1,7 +1,7 @@
 {{ with .Params.tags }}
     <p>
         <img style="display: inline-block; vertical-align: middle; margin-right: 4px;"
-            src="/feathericons/16px-a9a9b3/tag.svg" alt="Tags:"
+            src="/feathericons/16px-a9a9b3/tag.svg" alt="Tags:" title="Tags"
         >
         {{ range . -}}
             {{ if (not (eq . "pinned")) }}