When the values on the y-axis are long, the label for the y-axis is not properly given space, but instead overlaps with the values.
Two examples: one on Commons and one on Beta.

Here is also a screenshot from Commons for convenience:

Requirements

• Axis values should at most display 4 characters, including an abbreviation if needed. For example 1000000 would become 1M. We can use Intl.NumberFormat function to make sure these are localizable. See code below
• We will loosely enforce this 4 character requirement for the time being. Don't worry if exceptionally numbers such as 1,000,000,000,000,000,000 still overlap Y axis (likely abbreviated as 1,000,000T - this is out of scope).
• This should be true for both X and Y axis
• xAxis.nameGap and yAxis.nameGap value will be increased to accommodate 4 characters (to be tweaked later with Derek)

Formatter code

/**
 * @param {number} num
 * @return {string}
 */
function convertNumber( num, language ) {
    const formatter = new Intl.NumberFormat( language, {
		style: 'decimal',
        notation: num > 1000 ? 'compact' : 'standard',
        compactDisplay: 'short',
		minimumFractionDigits: 0,
		maximumFractionDigits: 1
	} );
    return formatter.format( num );
}