A struct that holds information on a plural translation.

This struct describes a translation which has a plural form, such as the one in the following snippet of .po file:

msgid "There was an error"
msgid_plural "There were %{count} errors"
msgstr[0] "C'è stato un errore"
msgstr[1] "Ci sono stati %{count} errori"

This struct contains three fields:

• msgid - the id of the singular translation.
• msgid_plural - the id of the pluralized translation.
• msgstr - a map which maps plural forms as keys to translated strings as values. The plural forms mentioned here are the ones described in Gettext.Plural.
• comments - a list of comments as they are found in the PO file (e.g., ["# foo"]).
• references - a list of references (files this translation comes from) in the form {file, line}.
• flags - a set of flags for this translation.
• po_source_line - the line this translation is on in the PO file where it comes from.