[FIX] web: decimal separator of percentage

When a percentage if formatted, the decimal separator used is always
`.`, while it should be the decimal separator of the language.

opw-1908220

closes odoo/odoo#30030

addons/web/static/src/js/fields/field_utils.js

@@ -363,7 +363,7 @@ function formatPercentage(value, field, options) {
     if (options.humanReadable && options.humanReadable(value * 100)) {
         return result + "%";
     }
-    return parseFloat(result) + "%";
+    return (parseFloat(result) + "%").replace('.', _t.database.parameters.decimal_point);
 }
 /**
  * Returns a string representing the value of the selection.

addons/web/static/tests/fields/field_utils_tests.js

@@ -135,7 +135,9 @@ QUnit.test('format binary', function (assert) {
 });
 
 QUnit.test('format percentage', function (assert) {
-    assert.expect(9);
+    assert.expect(11);
+
+    var originalParameters = _.clone(core._t.database.parameters);
 
     assert.strictEqual(fieldUtils.format.percentage(0), '0%');
     assert.strictEqual(fieldUtils.format.percentage(0.5), '50%');
@@ -151,6 +153,16 @@ QUnit.test('format percentage', function (assert) {
     assert.strictEqual(fieldUtils.format.percentage(50, null,
         {humanReadable: function (val) {return true;}}), '5k%'
     );
+
+    _.extend(core._t.database.parameters, {
+        grouping: [3, 0],
+        decimal_point: ',',
+        thousands_sep: '.'
+    });
+    assert.strictEqual(fieldUtils.format.percentage(0.125), '12,5%');
+    assert.strictEqual(fieldUtils.format.percentage(0.666666), '66,67%');
+
+    core._t.database.parameters = originalParameters;
 });
 
 QUnit.test('parse float', function(assert) {
@@ -262,7 +274,9 @@ QUnit.test('parse monetary', function(assert) {
 });
 
 QUnit.test('parse percentage', function(assert) {
-    assert.expect(7);
+    assert.expect(9);
+
+    var originalParameters = _.clone(core._t.database.parameters);
 
     assert.strictEqual(fieldUtils.parse.percentage(""), 0);
     assert.strictEqual(fieldUtils.parse.percentage("0"), 0);
@@ -271,6 +285,18 @@ QUnit.test('parse percentage', function(assert) {
     assert.strictEqual(fieldUtils.parse.percentage("1"), 1);
     assert.strictEqual(fieldUtils.parse.percentage("2%"), 0.02);
     assert.strictEqual(fieldUtils.parse.percentage("100%"), 1);
+
+    _.extend(core._t.database.parameters, {
+        grouping: [3, 0],
+        decimal_point: ',',
+        thousands_sep: '.'
+    });
+
+    assert.strictEqual(fieldUtils.parse.percentage("0,04"), 0.04);
+    assert.strictEqual(fieldUtils.parse.percentage("6,02%"), 0.0602);
+
+    core._t.database.parameters = originalParameters;
+
 })
 
 });