1) To get the translation I have to approve each line (smb has already translated) at the special page (for example: https://premium.wpmudev.org/translate/projects/wdeb/ru/default?page=5) – then I can export the .po or .mo and put it (.mo) to the language dir of the plugin. Is this correct?
2) Why should I translate at the special page (at wpmudev site) but in Poedit App (for example)?
3) When plugin will be updated what happen with the .mo? Deleted? Modified some how? (How can I safe .mo)