Add aliases for Georgian, Armenian, Spanish, and Japanese

Also make it possible to add multiple aliases for a language.

Bug: T178996
Change-Id: I00bb4a158caed0c1ba15d41e294281a001c917b1

tests/phpunit/LanguageSearchTest.php

@@ -67,10 +67,30 @@ class LanguageSearchTest extends PHPUnit_Framework_TestCase {
 				'pnb' => 'punjabi western',
 			]
 			],
+			[ 'castellano', [
+				'es' => 'castellano',
+			]
+			],
+			[ 'hayeren', [
+				'hy' => 'hayeren',
+			]
+			],
 			[ 'kartuli', [
 				'ka' => 'kartuli',
 			]
 			],
+			[ 'qartuli', [
+				'ka' => 'qartuli',
+			]
+			],
+			[ 'nihongo', [
+				'ja' => 'nihongo',
+			]
+			],
+			[ 'にほんご', [
+				'ja' => 'にほんご',
+			]
+			],
 			[ 'valencia', [
 				'ca' => 'valencia',
 			]