Hello!

I need to update/complete Croatian translation in order to do 2 SS sites in Croatian language which is not complete (yet).

The FAQ entry says:

Currently translated entities are not directly factored into code 
(for security reasons and release/review-control), so you can't see 
them straight away. You can download automatically generated php-files 
for your language on the translation-server for each module 
(e.g. cms, sapphire, forum, ...) - and place those files in the appropriate 
directories on a local silverstripe installation. Please use our daily-builds 
for your local installation.

The problem is that daily-builds link says:

Note: Daily build have been temporarily disabled while we update 
the system to work with github.

so I'm not sure if I start updating Croatian translation when & how will I be able to pull those changes back in order to use them in my sites?

Sincerely,
Gour

so I'm not sure if I start updating Croatian translation when & how will I be able to pull those changes back in order to use them in my sites?

If you provide translation through translate.silverstripe.org you should be able to download the PHP lang files instantly for your own installation. They will make it to the official github code before we prep for another release (or when Ingo has time!)