The bulk update request #1968 is active.

create alias flat_colored (0) -> flat_colors (19712)
create alias flatcolored (0) -> flat_colors (19712)
create alias flat_colours (0) -> flat_colors (19712)
create alias flatcolour (0) -> flat_colors (19712)
create alias flat_colour (0) -> flat_colors (19712)
create alias flat_coloured (0) -> flat_colors (19712)
create alias flatcoloured (0) -> flat_colors (19712)

Reason: Flatcolored and flat colored are commonly used terms to refer to flat colors. The rest are non-American spellings.

EDIT: The bulk update request #1968 (forum #326493) has been approved by @bitWolfy.