Describe the i18n reserved words

[jmooring]

See gohugoio/hugo#11687

id
: Uniquely identifies the message.

description
: Describes the message to give additional context to translators that may be relevant for translation.

hash
: Uniquely identifies the content of the message that this message was translated from.

leftdelim
: The left Go template delimiter.

rightdelim
: The right Go template delimiter.

zero
: The content of the message for the CLDR plural form "zero".

one
: The content of the message for the CLDR plural form "one".

two
: The content of the message for the CLDR plural form "two".

few
: The content of the message for the CLDR plural form "few".

many
: The content of the message for the CLDR plural form "many".

other
: The content of the message for the CLDR plural form "other".

[jmooring]

This will be addressed with #2099