HTML-based slide shows: add support for institute (#7289)

Add institute variable (string or list) to HTML-based slide formats.

data/templates/default.dzslides

@@ -171,7 +171,7 @@ $if(subtitle)$
   <h1 class="subtitle">$subtitle$</h1>
 $endif$
   <footer>
-    $if(author)$<span class="author">$for(author)$$author$$sep$, $endfor$</span>$endif$ · $if(date)$<span class="date">$date$</span>$endif$
+    $if(author)$<span class="author">$for(author)$$author$$sep$, $endfor$</span> · $endif$$if(institute)$<span class="institute">$for(institute)$$institute$$sep$, $endfor$</span> · $endif$$if(date)$<span class="date">$date$</span>$endif$
   </footer>
 </section>
 $endif$

data/templates/default.revealjs

@@ -52,6 +52,9 @@ $endif$
 $for(author)$
   <p class="author">$author$</p>
 $endfor$
+$for(institute)$
+  <p class="institute">$institute$</p>
+$endfor$
 $if(date)$
   <p class="date">$date$</p>
 $endif$

data/templates/default.s5

@@ -61,6 +61,9 @@ $endif$
 $if(author)$
   <h3 class="author">$for(author)$$author$$sep$<br/>$endfor$</h3>
 $endif$
+$if(institute)$
+  <h3 class="institute">$for(institute)$$institute$$sep$<br/>$endfor$</h3>
+$endif$
 $if(date)$
   <h4 class="date">$date$</h4>
 $endif$

data/templates/default.slideous

@@ -63,9 +63,16 @@ $if(title)$
 $if(subtitle)$
   <h1 class="subtitle">$subtitle$</h1>
 $endif$
+$if(author)$
   <p class="author">
 $for(author)$$author$$sep$<br/>$endfor$
   </p>
+$endif$
+$if(institute)$
+  <p class="institute">
+$for(institute)$$institute$$sep$<br/>$endfor$
+  </p>
+$endif$
 $if(date)$
   <p class="date">$date$</p>
 $endif$

data/templates/default.slidy

@@ -52,6 +52,11 @@ $if(author)$
 $for(author)$$author$$sep$<br/>$endfor$
   </p>
 $endif$
+$if(institute)$
+  <p class="institute">
+$for(institute)$$institute$$sep$<br/>$endfor$
+  </p>
+$endif$
 $if(date)$
   <p class="date">$date$</p>
 $endif$