Hide some useless elements when printing

bandeaux.php

@@ -28,7 +28,7 @@ function bandeau_titre($titre)
     echo '
     <header role="banner">';
     if(count($ALLOWED_LANGUAGES)>1){
-        echo '<form method="post" action="">
+        echo '<form method="post" action="" class="hidden-print">
             <div class="input-group input-group-sm pull-right col-md-2 col-xs-4">
                 <select name="lang" class="form-control" title="'. _("Select the language") .'" >' . liste_lang() . '</select>
                 <span class="input-group-btn">

tpl/header.tpl

@@ -1,6 +1,6 @@
     <header role="banner">
     {if count($langs)>1}
-        <form method="post" action="">
+        <form method="post" action="" class="hidden-print">
             <div class="input-group input-group-sm pull-right col-md-2 col-xs-4">
                 <select name="lang" class="form-control" title="${_("Select the language")}" >
                 {foreach $langs as $lang_key=>$lang_value}

tpl/part/comments.tpl

@@ -1,4 +1,4 @@
-<hr role="presentation" id="comments"/>
+<hr role="presentation" id="comments" class="hidden-print"/>
 <form action="#comments" method="POST">
 
     {* Comment list *}

tpl/part/poll_info.tpl

@@ -19,7 +19,7 @@
                     </div>
                 {/if}
             </div>
-            <div class="col-md-5">
+            <div class="col-md-5 hidden-print">
                 <div class="btn-group pull-right">
                     <button onclick="print(); return false;" class="btn btn-default"><span class="glyphicon glyphicon-print"></span> {_('Print')}</button>
                     <a href="{$SERVER_URL}exportcsv.php?poll={$poll_id}" class="btn btn-default"><span class="glyphicon glyphicon-download-alt"></span> {_('Export to CSV')}</a>

tpl/part/vote_table_classic.tpl

@@ -10,7 +10,7 @@
             <caption class="sr-only">{_('Votes of the poll')} {$poll->title}</caption>
             <thead>
             {if $admin}
-                <tr>
+                <tr class="hidden-print">
                     <th role="presentation"></th>
                     {foreach $slots as $id=>$slot}
                         <td headers="C{$id}">

tpl/part/vote_table_date.tpl

@@ -10,7 +10,7 @@
             <caption class="sr-only">{_('Votes of the poll')} {$poll->title}</caption>
             <thead>
             {if $admin}
-                <tr>
+                <tr class="hidden-print">
                     <th role="presentation"></th>
                     {$headersDCount=0}
                     {foreach $slots as $slot}