code: def pressure_trend_text(trend):
      
      _ = pywws.localisation.translation.ugettext
      if trend > 6.0:
          return _(u'rising very rapidly')
      elif trend > 3.5:
          return _(u'rising quickly')
      elif trend > 1.5:
          return _(u'rising')
      elif trend >= 0.1:
          return _(u'rising slowly')
      elif trend < -6.0:
          return _(u'falling very rapidly')
      elif trend < -3.5:
          return _(u'falling quickly')
      elif trend < -1.5:
          return _(u'falling')
      elif trend <= -0.1:
          return _(u'falling slowly')
      return _(u'steady')
docs: Convert pressure trend to a string, as used by the UK met
      office.