BuddyPress.org

ctrl + f in most text editors will allow you to search.

Make sure you follow the instructions here:
https://codex.buddypress.org/how-to-guides/customizing-labels-messages-and-urls/

“….For those of you using a text editor, although you can search and replace to make changes, make sure that you are not editing msgid entries. Your custom text goes into the lines labeled msgstr only. For each customization you’ll need to enter your customized text between the quotes on the msgstr line….”