Merge tag '1.8.18' of git://github.com/Elgg/Elgg into develop

1.8.18

Conflicts:
	mod/tinymce/vendor/tinymce/jscripts/tiny_mce/langs/en.js
	mod/tinymce/vendor/tinymce/jscripts/tiny_mce/themes/advanced/langs/en_dlg.js

1 files changed, 21 insertions, 3 deletions

diff --git a/views/default/js/languages.php b/views/default/js/languages.php
index c51d7bcb2..fcf903d4b 100644
--- a/views/default/js/languages.php
+++ b/views/default/js/languages.php
@@ -1,15 +1,33 @@
 <?php
 /**
  * @uses $vars['language']
+ * @uses $vars['lc'] if present, client will be sent long expires headers
  */
-global $CONFIG;
 
 $language = $vars['language'];
+$lastcache = elgg_extract('lc', $vars, 0);
 
-$translations = $CONFIG->translations['en'];
+// @todo add server-side caching
+if ($lastcache) {
+	// we're relying on lastcache changes to predict language changes
+	$etag = '"' . md5("$language|$lastcache") .  '"';
+
+	header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', strtotime("+6 months")), true);
+	header("Pragma: public", true);
+	header("Cache-Control: public", true);
+	header("ETag: $etag");
+
+	if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && trim($_SERVER['HTTP_IF_NONE_MATCH']) === $etag) {
+		header("HTTP/1.1 304 Not Modified");
+		exit;
+	}
+}
+
+$all_translations = elgg_get_config('translations');
+$translations = $all_translations['en'];
 
 if ($language != 'en') {
-	$translations = array_merge($translations, $CONFIG->translations[$language]);
+	$translations = array_merge($translations, $all_translations[$language]);
 }
 
 echo json_encode($translations);
\ No newline at end of file