Improve settings page and move some config parameters to the database

app/Templates/config_application.php

@@ -0,0 +1,23 @@
+<div class="page-header">
+    <h2><?= t('Application settings') ?></h2>
+</div>
+<section>
+<form method="post" action="<?= Helper\u('config', 'application') ?>" autocomplete="off">
+
+    <?= Helper\form_csrf() ?>
+
+    <?= Helper\form_label(t('Application URL'), 'application_url') ?>
+    <?= Helper\form_text('application_url', $values, $errors, array('placeholder="http://example.kanboar.net/"')) ?><br/>
+    <p class="form-help"><?= t('Example: http://example.kanboard.net/ (used by email notifications)') ?></p>
+
+    <?= Helper\form_label(t('Language'), 'application_language') ?>
+    <?= Helper\form_select('application_language', $languages, $values, $errors) ?><br/>
+
+    <?= Helper\form_label(t('Timezone'), 'application_timezone') ?>
+    <?= Helper\form_select('application_timezone', $timezones, $values, $errors) ?><br/>
+
+    <div class="form-actions">
+        <input type="submit" value="<?= t('Save') ?>" class="btn btn-blue"/>
+    </div>
+</form>
+</section>