For example you need to add: “Resend Verification Email” into the PO file. You have to add it manually. Please follow below steps to add text into PO file.
1. Go to wordpress/wp-content/plugins/userpro/languages directory and open the file for your language
2. Find “Forgot your password? ” text and add “Resend Verification Email” text below “Forgot your password? ” text
3. Add the translation for the above line and save it.
4. Then create new .mo file using http://po2mo.net and save it into plugins/userpro/languages folder.