How to locate a line in a php file for a .po translation?

Question

Internationalization and localization

Tell experts.
There is a translation file .po
I want to insert my new values ​​​​into English + translation to them.
For example:

#: functions.php:3850
msgid "Portfolio"
msgstr "Портфоліо"

3850, as I understand it, is a line, but according to this example, in the functions.php file, there is no text "Portfolio" on this line, and I found the text itself somewhere on line 3926. And in this case, then it is not clear how to attach these lines .po file to php file

Answer 1

1. This is just a comment.
2. Such a binding does not make any sense.