Apart from the theme translation functionality, a stopping missing feature is the translation of portal and email component. All those messages are hardcoded in js files not translatable by themes.
Any non English spoken ghost webmaster is not able to offer a proper ghost project in his language easily.
I would be glad to help.
Regards
Please see also More customization for portal
Maybe these can be rolled up into the same feature request?
(Basically, portal to be more customizable)
Yes, I suppose so… but may be this one is smaller and faster to have ready as it does not need any front.
Seconding this! I have a couple of Ghost websites in French, where I use Portal (because it’s gorgeous, simple to use and built-in). Portal (and the emails) are the only things that are not in French. Would be great for my customers to have everything in French.
I second this.
I also want to translate to french 
I also want to translate to Ukrainian and Russian
i can translate do brazilian portuguese =)
I would like to help translate into Spanish and Catalan.
I also vote for this feature
Is there a way to hard code the translation on the server? Similar to how you can do with emails Ghost Email customization - #3 by Izak_Jackson