Media items uploaded using the Upload media dialog box are created as Versioned and in the default language only, regardless of the Media.UploadAsVersionableByDefault setting value.
To fix this issue: Download and install the following patch: Sitecore.Support.162905. In the \App_Config\Sitecore.config file, make sure that the Media.UploadAsVersionableByDefault setting value is "false" . After the patch is installed, the media items uploaded using the Upload media dialog box are created in the context language if the Media.UploadAsVersionableByDefault setting is set to "false".