use utf8_unicode_ci instead of utf8_general_ci

apps/advanced/console/migrations/m130524_201442_init.php

@@ -9,7 +9,8 @@ class m130524_201442_init extends Migration
     {
         $tableOptions = null;
         if ($this->db->driverName === 'mysql') {
-            $tableOptions = 'CHARACTER SET utf8 COLLATE utf8_general_ci ENGINE=InnoDB';
+            // http://stackoverflow.com/questions/766809/whats-the-difference-between-utf8-general-ci-and-utf8-unicode-ci
+            $tableOptions = 'CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE=InnoDB';
         }
 
         $this->createTable('{{%user}}', [

framework/rbac/migrations/m140506_102106_rbac_init.php

@@ -36,7 +36,8 @@ class m140506_102106_rbac_init extends \yii\db\Migration
 
         $tableOptions = null;
         if ($this->db->driverName === 'mysql') {
-            $tableOptions = 'CHARACTER SET utf8 COLLATE utf8_general_ci ENGINE=InnoDB';
+            // http://stackoverflow.com/questions/766809/whats-the-difference-between-utf8-general-ci-and-utf8-unicode-ci
+            $tableOptions = 'CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE=InnoDB';
         }
 
         $this->createTable($authManager->ruleTable, [