Comment form bug fixes

- Better support of single sign-on
- Added missing translation call

themes/bootstrap3/templates/RecordTab/usercomments.phtml

@@ -20,6 +20,7 @@
       <input class="btn btn-primary" data-loading-text="<?=$this->transEsc('Submitting') ?>..." type="submit" value="<?=$this->transEsc("Add your comment")?>"/>
     </div>
   <?php else: ?>
-    <a href="<?=$this->url('myresearch-userlogin') ?>" class="btn btn-primary" data-lightbox title="Login"><i class="fa fa-sign-in" aria-hidden="true"></i> <?=$this->transEsc("You must be logged in first") ?></a>
+    <?php $singleSignOn = $this->auth()->getManager()->getSessionInitiator($this->serverUrl(true)); ?>
+    <a href="<?=$this->url('myresearch-userlogin') ?>" class="btn btn-primary"<?php if (!$singleSignOn): ?> data-lightbox<?php endif; ?> title="<?=$this->transEsc('Login')?>"><i class="fa fa-sign-in" aria-hidden="true"></i> <?=$this->transEsc("You must be logged in first") ?></a>
   <?php endif; ?>
 </form>