Translation

How can I translate the button “Join Group” that appears under the icon of the group?

Also, there are some messages that i couldn’t find in the default language.
Like this one:
“You sent membership request to join this Group on 2023-09-06 01:49:09”

And last, but not least, how can I help translating Profilegrid plugin to Brazilian Portuguese ( pt-BR )?

Thank You!

The page I need help with: [log in to see the link]