As the language files are grabbed directly from Crowding and users can update translations within one-lick, before every release should be fine.

No, sorry - I meant for us.
There will be always changes at some files: adding, deleting and changing variables.
But these files haev to be imported at Crowdin for us - the translators - to be able to translate.

So, adding these files BEFORE a release is made AND building a new package at Crodwin will include those files with deleted / changed variables.
If these packages are used, Arastta will have troubles ...

But we - the translators - should have enough time for translating and adopting.

How will this process be handled in future?

I'm not sure I got your point so could you plz open a new discussion in the Translation Team group: http://arastta.org/community/groups/item/5-translation-team