Extend oslo.i18n to support more gettext functionality

Registered by Peng Wu

The oslo.i18n library already supports the standard gettext function.

But from the below wiki, it seems good to also support "contextual markers" and "plural form" gettext functions.
URL: https://wiki.openstack.org/wiki/I18n/TranslatableStrings

I plan to add some more gettext methods to oslo.i18n library,
such as pgettext, ngettext and ungettext.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Peng Wu
Direction:
Needs approval
Assignee:
None
Definition:
Superseded
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Peng Wu

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