po
What is a .po file?
text/x-gettext-translation
A PO file (.po, Portable Object) is a gettext translation catalog: a plain-text list of msgid (source string) and msgstr (translation) pairs, with a header defining the language and plural rules, source-location comments, and support for plural forms. It is the working file translators edit and is compiled to a binary .mo for runtime.
How to use a .po file
Use an example .po file to test gettext parsers, PO editors and CAT tools, translation-memory importers, and PO-to-JSON/XLIFF converters, or to exercise plural-form handling.