Use correct context when parsing MO file.

lib/Cake/I18n/I18n.php

@@ -478,6 +478,7 @@ class I18n {
  *
  * @param string $filename Binary .mo file to load
  * @return mixed Array of translations on success or false on failure
+ * @link https://www.gnu.org/software/gettext/manual/html_node/MO-Files.html
  */
 	public static function loadMo($filename) {
 		$translations = false;
@@ -486,7 +487,6 @@ class I18n {
 		// Binary files extracted makes non-standard local variables
 		if ($data = file_get_contents($filename)) {
 			$translations = array();
-			$context = null;
 			$header = substr($data, 0, 20);
 			$header = unpack('L1magic/L1version/L1count/L1o_msg/L1o_trn', $header);
 			extract($header);
@@ -496,6 +496,7 @@ class I18n {
 					$r = unpack("L1len/L1offs", substr($data, $o_msg + $n * 8, 8));
 					$msgid = substr($data, $r["offs"], $r["len"]);
 					unset($msgid_plural);
+					$context = null;
 
 					if (strpos($msgid, "\x04") !== false) {
 						list($context, $msgid) = explode("\x04", $msgid);

lib/Cake/Test/Case/I18n/I18nTest.php

@@ -2054,6 +2054,9 @@ class I18nTest extends CakeTestCase {
 		$this->assertSame("danspartij", __x('social gathering', 'ball'));
 		$this->assertSame("balans", __('balance'));
 		$this->assertSame("saldo", __x('money', 'balance'));
+
+		// MO file is sorted by msgid, 'zoo' should be last
+		$this->assertSame("dierentuin", __('zoo'));
 	}
 
 /**

lib/Cake/Test/test_app/Locale/nld/LC_MESSAGES/default.po

@@ -26,4 +26,7 @@ msgstr "balans"
 
 msgctxt "money"
 msgid "balance"
-msgstr "saldo"
+msgstr "saldo"
+
+msgid "zoo"
+msgstr "dierentuin"