Convert a file to a PO file. More information: https://po4a.org/man/man1/po4a-gettextize.1.php.
po4a-gettextize --format text --master path/to/master.txt --po path/to/result.po
po4a-gettextize --help-format
-l
option can be provided multiple times):po4a-gettextize --format text --master path/to/master.txt --localized path/to/translated.txt --po path/to/result.po