Re: Which file contains the 'Check your email account' message after registration?
Don’t hardcode the BP files, use child theme to make changes
The POT file is the catalogue. You have nothing to change in it.
The PO file is the work file
The MO file contains the PO compilated datas who will be read by WP
If you want to modify BP messages or different text, you have to edit a PO (without T) file. Use poEdit (or equivalent)
When you save the file, poEdit creates automaticaly a compilated mo file Your modification will be in this file, and this file had to be in the right folder on your site !
Also, if you use BP 1.2.8, your buddypress-xx_XX.mo should be in wp-content/languages folder, no more in buddypress/bp-languages 
