Compile message catalog to binary format. More information: https://www.gnu.org/software/gettext/manual/html_node/msgfmt-Invocation.html.
messages.mo:msgfmt {{file.po}}
.po file to a .mo file:msgfmt {{path/to/file.po}} {{[-o|--output-file]}} {{path/to/file.mo}}
msgfmt {{[-h|--help]}}