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I'm also a Brazilian guy who is studying Georgian.
I suggest you use HelloTalk and Speaky, you'll find many Georgians who want to learn English, French, Spanish and Portuguese. Exchange with them, i.e., teach English, French, German, Spanish or Portuguese to them and they taught Georgian to you.
On Android:
These are good dictionaries of English-Georgian.
On the PC:
On iOS:
Google Translate on Android and iOS offers offline pack of Georgian, but only if you use only the vocabulary. The translation of a sentence isn't trustful.
You can get grammar and verbs tables:
By curiosity, how many languages and which language do you speak?