@python_2_unicode_compatible

class ProposalBase(models.Model):

    objects = InheritanceManager()

    kind = models.ForeignKey(ProposalKind, verbose_name=_("Kind"))

    title = models.CharField(max_length=100, verbose_name=_("Title"))

    abstract = models.TextField(

        _("Abstract"),

        help_text=_("This will appear in the conference programme. Up to about "

                    "500 words. Edit using <a "

    )

    abstract_html = models.TextField(blank=True)

    private_abstract = models.TextField(

        _("Private Abstract"),

        help_text=_("This will only be shown to organisers and reviewers. You "

                    "should provide any details about your proposal that you "

    )

    private_abstract_html = models.TextField(blank=True)

    technical_requirements = models.TextField(

        _("Special Requirements"),

        blank=True,

        help_text=_("Speakers will be provided with: Internet access, power, "

                    "projector, audio.  If you require anything in addition, "

                    "please list your technical requirements here.  Such as: a "

                    "static IP address, A/V equipment or will be demonstrating "

                    "security-related techniques on the conference network. "

                    "Edit using <a "

    )

    technical_requirements_html = models.TextField(blank=True)

    project = models.CharField(

        max_length=100,

        blank=True,

        help_text=_("The name of the project you will be talking about."),

    )

    project_url = models.URLField(

        _("Project URL"),

        blank=True,

        help_text=_("If your project has a webpage, specify the URL here so "