* remember installation language on first step (welcome)

install/steps/1-welcome.php

@@ -18,10 +18,11 @@ else {
 			$locales[] = array('id' => $tmp_locale, 'name' => $locale['name']);
 		}
 	}
+
 	$twig->display('install.welcome.html.twig', array(
 		'locales' => $locales,
 		'locale' => $locale,
+		'cookie_locale' => @$_COOKIE['locale'],
 		'buttons' => next_buttons(false, true)
 	));
-}
-?>
+}

system/templates/install.welcome.html.twig

@@ -3,7 +3,7 @@
 	<div class="input"><p>{{ locale.step_welcome_desc }}</p>
 		<select name="lang">
 			{% for locale_ in locales %}
-				<option value="{{ locale_.id }}">{{ locale_.name }}</option>
+				<option value="{{ locale_.id }}"{% if cookie_locale == locale_.id %} selected{% endif %}>{{ locale_.name }}</option>
 			{% endfor %}
 		</select>
 	</div>