Add jinja l18n support, move l10n domain.
Add jinja l18n support, move l10n domain.

  * Add support for plural forms in jinja2 templates.
  * Move l10n domain registration for reports in common
    module.

joyxu/kernelci-backend,kernelci/kernelci-backend,kernelci/kernelci-backend,joyxu/kernelci-backend,joyxu/kernelci-backend