I am frequently finding incorrect translations from German to Portuguese, is there any way to suggest a correction directly in the lesson, or only by opening topics in the forum?
You should see the “Report 
” above the Suggested Meanings section, where you can report wrong translations.
I meant the translation of the lesson, not of each word, when you click on show translation, often it is wrong.
Ahh, I see. Feel free to report those via email - support(at)lingq.com