Not technically dictionaries but Kiwix does Wiki’s offline. Unfortunately its only the wiki’s they provide or you have to scrape yourself.

LMGTFY: https://www/[.]newsbreak[.]com/earth-com-2402525/4541337878394-improvised-condom-use-in-a-rainforest-study-helped-scientists-discover-something-strange-about-cicadas

Just ask them to hold your sack.

As a android app RTranslate exists. Is it the best? Probably not. Has it worked for me so far? Absolutely.

As an American sysadmin that mainly works in a mainly google house, there is literally just a checkbox that says ‘The users in this OU are 18+’. Can’t say for MS though.