fix: Scales correctly respect the locale setting when generating labels (#8710)

src/scales/scale.linearbase.js

@@ -275,6 +275,6 @@ export default class LinearScaleBase extends Scale {
   }
 
   getLabelForValue(value) {
-    return formatNumber(value, this.options.locale);
+    return formatNumber(value, this.chart.options.locale);
   }
 }

src/scales/scale.logarithmic.js

@@ -149,7 +149,7 @@ export default class LogarithmicScale extends Scale {
 	 * @return {string}
 	 */
   getLabelForValue(value) {
-    return value === undefined ? '0' : formatNumber(value, this.options.locale);
+    return value === undefined ? '0' : formatNumber(value, this.chart.options.locale);
   }
 
   /**

test/specs/scale.linear.tests.js

@@ -303,6 +303,46 @@ describe('Linear Scale', function() {
     expect(chart.scales.y.getLabelForValue(7)).toBe('7');
   });
 
+  it('Should correctly use the locale setting when getting a label', function() {
+    var chart = window.acquireChart({
+      type: 'line',
+      data: {
+        datasets: [{
+          xAxisID: 'x',
+          yAxisID: 'y',
+          data: [{
+            x: 10,
+            y: 100
+          }, {
+            x: -10,
+            y: 0
+          }, {
+            x: 0,
+            y: 0
+          }, {
+            x: 99,
+            y: 7
+          }]
+        }],
+      },
+      options: {
+        locale: 'de-DE',
+        scales: {
+          x: {
+            type: 'linear',
+            position: 'bottom'
+          },
+          y: {
+            type: 'linear'
+          }
+        }
+      }
+    });
+    chart.update();
+
+    expect(chart.scales.y.getLabelForValue(7.07)).toBe('7,07');
+  });
+
   it('Should correctly determine the min and max data values when stacked mode is turned on', function() {
     var chart = window.acquireChart({
       type: 'line',

test/specs/scale.logarithmic.tests.js

@@ -712,6 +712,39 @@ describe('Logarithmic Scale tests', function() {
     expect(chart.scales.y.getLabelForValue(150)).toBe('150');
   });
 
+  it('should correctly use the locale when generating the label', function() {
+    var chart = window.acquireChart({
+      type: 'bar',
+      data: {
+        datasets: [{
+          yAxisID: 'y',
+          data: [10, 5, 5000, 78, 450]
+        }, {
+          yAxisID: 'y1',
+          data: [1, 1000, 10, 100],
+        }, {
+          yAxisID: 'y',
+          data: [150]
+        }],
+        labels: []
+      },
+      options: {
+        locale: 'de-DE',
+        scales: {
+          y: {
+            type: 'logarithmic'
+          },
+          y1: {
+            position: 'right',
+            type: 'logarithmic'
+          }
+        }
+      }
+    });
+
+    expect(chart.scales.y.getLabelForValue(10.25)).toBe('10,25');
+  });
+
   describe('when', function() {
     var data = [
       {