[iA1]

You will have to edit at least 6 templates to apply specific class to forum title. Search for $forum[title] in templates and in each of the results, look for the line:
<a href="forumdisplay.php?$session[sessionurl]f=$forum[forumid]">$forum[title]</a>

Edit that line and add class="forumtitle" just before href. It will look like this:
<a class="forumtitle" href="forumdisplay.php?$session[sessionurl]f=$forum[forumid]">$forum[title]</a>

Then edit the footer template and add this code at the end:

<script>
  var x = document.getElementsByClassName("forumtitle");
  var i;
  for (i = 0; i < x.length; i++) {
    x[i].innerHTML=x[i].innerHTML.toLowerCase();
  }
</script>
<style>.forumtitle{text-transform:capitalize}</style>

Instead of all this, the easiest way is to simply edit the forum titles manually in Forum Manager in admincp.