typo in sliders conf.py file

[sender707]

''text-bright instead of 'tex-bright'

SLIDERSLIDE_TEXT_COLORS = getattr(
settings,
'SLIDERS_SLIDERSLIDE_TEXT_COLORS',
(
('', _('defined by css')),
('tex-bright', _('bright')),
('text-dark', _('dark')),
)
)