messages.contrastRatioString(default: "Contrast ratio")
Allows customization of the "Contrast ratio" text in the contrast tool.
Example
<div id="colorgradient"></div>
<script>
$("#colorgradient").kendoColorGradient({
    contrastTool: true,
    messages: {
        contrastRatio: "Color Contrast"
    }
});
</script>
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