Convert application header to grid system

app/Template/header/board_selector.php

@@ -0,0 +1,13 @@
+<select id="board-selector"
+        class="chosen-select select-auto-redirect"
+        tabindex="-1"
+        data-search-threshold="0"
+        data-notfound="<?= t('No results match:') ?>"
+        data-placeholder="<?= t('Display another project') ?>"
+        data-redirect-regex="PROJECT_ID"
+        data-redirect-url="<?= $this->url->href('BoardViewController', 'show', array('project_id' => 'PROJECT_ID')) ?>">
+    <option value=""></option>
+    <?php foreach ($board_selector as $board_id => $board_name): ?>
+        <option value="<?= $board_id ?>"><?= $this->text->e($board_name) ?></option>
+    <?php endforeach ?>
+</select>