util/rest/templates/button-new.tpl

% from rest.tool_color import color
% setdefault('tool', None)
% color = color.get(tool, None)
% label = "New" if not tool else f"New {tool.title()}"
% style = f'style="background-color: {color}"' if color else ''
<button class="button-resize pure-button" type="submit" form="new" {{!style}}>{{ label }}</button>