.po files

The .mo and .po language files have been removed as of version 1.4.7
https://ww.wp.xz.cn/plugins/anual-archive/changelog/

Languages are now handled using WordPress’ build in language packs:
https://translate.ww.wp.xz.cn/projects/wp-plugins/anual-archive

For more information on how to install language packs, please see:
http://ottopress.com/2013/language-packs-101-prepwork/
http://wptavern.com/how-to-prepare-and-take-advantage-of-language-packs-for-plugins-hosted-on-wordpress-org

If there is a language that you would like to translate, let me know and I will request that you be added.