mate-volume-control: Speaker testing dialog changes size on pressing "Test" in Russian localization

When "Test" button is pressed (RU: "Проверить"), the window "Speaker testing" (RU: "Проверка динамиков") becomes wider.

Steps to reproduce the behaviour:

In Russian localization "ru_RU".
Start mate-volume-control, click on "Hardware" tab (RU: "Оборудование"), then on the "Test Speakers" button (RU: "Проверить динамики") below. Click on "Test" buttons in the new dialog to watch the symptom.
This is not reproduced in English localization.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: mate-media 1.26.0-0ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-22.22-generic 5.13.19
Uname: Linux 5.13.0-22-generic x86_64
ApportVersion: 2.20.11-0ubuntu71
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: MATE
Date: Sun Dec 19 15:45:10 2021
InstallationDate: Installed on 2021-12-15 (3 days ago)
InstallationMedia: Ubuntu-MATE 21.10 "Impish Indri" - Release amd64 (20211012)
SourcePackage: mate-media
UpgradeStatus: No upgrade log present (probably fresh install)