Board Game Arena

There are many cards for Echoes of Time that don't have a complete translation of their effects in Italian, some words are still in English, how can it be fixed?

I looked into the translation panel for the game but all the strings are related to the interface and not the card themselves.

If there are no relevant strings in the translation center for the game, or if the translated strings do not appear in the game, you should make a bug report.
But first check the 10 translation bug reports that already exist for the game, maybe one of them is relevant. Then vote for it.