Decimal separator is shown incorrect in PivotTable

[konyashkina]

Tested on:
Jmix version: 1.1.0-SNAPSHOT
Jmix Studio plugin version: 1.1.SNAPSHOT3437-211
IntelliJ version: IntelliJ IDEA 2021.1.3 (Community Edition)
OS. Windows 10 Pro

There are some numeric values like 125,912.36 and 236,999.08

AR: These values are shown in PivotTable like '125' and 236':

ER: Numeric values are shown properly in PivotTable.

I've tested it with different aggregation mode, looks like it doesn't matter.

For QA

As an additional cases:

1. Setup PivotTableExtension for the PivotTable and set totalBill property as a row:
   
   And try to export this PivotTable. The value under Total Bill (19096.66) should be recognized as a number.
2. Do the same but with Russian locale.

[Flaurite]

Caused by: #479

[konyashkina]

Tested on:
Jmix version: 1.1.0-SNAPSHOT
Jmix Studio plugin version: 1.1.SNAPSHOT3454-211
IntelliJ version: IntelliJ IDEA 2021.1.3 (Community Edition)

Verified.
Decimal separator is shown correct in ui and in xlsx.
The additional cases tested (with LibreOffice to open xlsx): the value under Total Bill is recognized as a number.