Some responsive

tpl/header.tpl

     <header role="banner">
     {if count($langs)>1}
         <form method="post" action="" class="hidden-print">
-            <div class="input-group input-group-sm pull-right col-md-2 col-xs-4">
+            <div class="input-group input-group-sm pull-right col-xs-12 col-sm-2">
                 <select name="lang" class="form-control" title="{__('Language selector', 'Select the language')}" >
                 {foreach $langs as $lang_key=>$lang_value}
                     <option lang="{substr($lang_key, 0, 2)}" {if substr($lang_key, 0, 2)==$locale}selected{/if} value="{$lang_key|html}">{$lang_value|html}</option>
@@ -14,7 +14,11 @@
         </form>
     {/if}
 
-        <h1><a href="{$SERVER_URL|html}" title="{__('Generic', 'Home')} - {$APPLICATION_NAME|html}"><img src="{$TITLE_IMAGE|resource}" alt="{$APPLICATION_NAME|html}"/></a></h1>
+        <h1>
+            <a href="{$SERVER_URL|html}" title="{__('Generic', 'Home')} - {$APPLICATION_NAME|html}" class="col-xs-12 col-sm-10">
+                <img src="{$TITLE_IMAGE|resource}" alt="{$APPLICATION_NAME|html}" class="img-responsive"/>
+            </a>
+        </h1>
         {if !empty($title)}<h2 class="lead"><i>{$title|html}</i></h2>{/if}
         <hr class="trait" role="presentation" />
     </header>

tpl/index.tpl

@@ -2,7 +2,7 @@
 
 {block name=main}
     <div class="row">
-        <div class="col-md-6 text-center">
+        <div class="col-xs-12 col-md-6 text-center">
             <p class="home-choice">
                 <a href="{$SERVER_URL}create_poll.php?type=date" class="opacity" role="button">
                     <img class="img-responsive center-block" src="{'images/date.png'|resource}" alt=""/>
@@ -14,7 +14,7 @@
                 </a>
             </p>
         </div>
-        <div class="col-md-6 text-center">
+        <div class="col-xs-12 col-md-6 text-center">
             <p class="home-choice">
                 <a href="{$SERVER_URL}create_poll.php?type=autre" class="opacity" role="button">
                     <img alt="" class="img-responsive center-block" src="{'images/classic.png'|resource}"/>
@@ -26,7 +26,7 @@
                 </a>
             </p>
         </div>
-        <div class="col-md-6 col-md-offset-3 text-center">
+        <div class="col-xs-12 col-md-6 col-md-offset-3 text-center">
             <p class="home-choice">
                 <a href="{$SERVER_URL}find_polls.php" class="opacity" role="button">
                     <span class="btn btn-warning btn-lg">