Make sure plurals keys are ignored

Author: kasimi

tests/testFiles/language/en/common.php

@@ -13,4 +13,8 @@
 $lang = array_merge($lang, array(
 	'A' => 'First language string',
 	'B' => 'Second language string',
+	'C' => [
+		1 => 'Singular',
+		2 => 'Plural',
+	],
 ));

tests/testFiles/language/en_complete/common.php

@@ -18,4 +18,9 @@
 	'B' => 'Second language string',
 );
 
-$lang = array_merge($lang, $b);
+$lang = array_merge($lang, $b, [
+	'C' => [
+		// Missing plural should not generate an error
+		1 => 'Singular',
+	],
+]);

tests/testFiles/language/en_incomplete/common.php

@@ -12,4 +12,8 @@
 
 $lang = array_merge($lang, array(
 	'A' => 'First language string',
+	'C' => [
+		1 => 'Singular',
+		2 => 'Plural',
+	],
 ));