- 🇨🇳China kongkx
I think add context to all unit string is better.
self::MILLIMETER => t('mm', [], ['context' => 'length unit']), self::CENTIMETER => t('cm', [], ['context' => 'length unit']), self::METER => t('m', [], ['context' => 'length unit']), self::KILOMETER => t('km', [], ['context' => 'length unit']), self::INCH => t('in', [], ['context' => 'length unit']), self::FOOT => t('ft', [], ['context' => 'length unit']), self::NAUTICAL_MILE => t('M', [], ['context' => 'length unit']),