Added Swedish translations for Yii messages.

framework/messages/config.php

@@ -7,7 +7,7 @@ return [
     'messagePath' => __DIR__,
     // array, required, list of language codes that the extracted messages
     // should be translated to. For example, ['zh-CN', 'de'].
-    'languages' => ['ar', 'bg', 'ca', 'cs', 'da', 'de', 'el', 'es', 'et', 'fa-IR', 'fi', 'fr', 'hu', 'id', 'it', 'ja', 'kk', 'ko', 'lt', 'lv', 'nl', 'pl', 'pt', 'pt-BR', 'ro', 'ru', 'sk', 'sr', 'sr-Latn', 'th', 'uk', 'vi', 'zh-CN','zh-TW'],
+    'languages' => ['ar', 'bg', 'ca', 'cs', 'da', 'de', 'el', 'es', 'et', 'fa-IR', 'fi', 'fr', 'hu', 'id', 'it', 'ja', 'kk', 'ko', 'lt', 'lv', 'nl', 'pl', 'pt', 'pt-BR', 'ro', 'ru', 'sk', 'sr', 'sr-Latn', 'sv', 'th', 'uk', 'vi', 'zh-CN','zh-TW'],
     // string, the name of the function for translating messages.
     // Defaults to 'Yii::t'. This is used as a mark to find the messages to be
     // translated. You may use a string for single function name or an array for