score:1

Accepted answer

you could replace the comma value with a dot value by using replace and parsing it into a float:

y: parsefloat(('1,5').replace(/\,/g, '.'))

http://jsfiddle.net/y30ktm2a/

score:1

hi i am not sure what is your aim if you would like see on tooltip than you set below code before initialize chart you can find internationalization

highcharts.setoptions({
lang: {
    decimalpoint: ','
}
});

edited for working code

highcharts.setoptions({
lang: {
    decimalpoint: ','
}
});
highcharts.chart('container', {
chart: {
    plotbackgroundcolor: null,
    plotborderwidth: null,
    plotshadow: false,
    type: 'pie'
},
title: {
    text: 'browser market shares january, 2015 to may, 2015'
},
series: [{
    name: 'brands',        
    data: [{
        name: 'microsoft internet explorer',
        y: parsefloat(('1,5').replace(/\,/g, '.'))
    }, {
        name: 'chrome',
        y: parsefloat(('4').replace(/\,/g, '.'))
    }]
}]
});

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