Your ROOT_URL in app.ini is http://git.osmesh.ru/ but you are visiting https://git.osmesh.ru/MOS/OpenBoard/commit/60f4237feb4ff9304c4662c72b42e7c98640d894?style=split&whitespace=ignore-change
You should set ROOT_URL correctly, otherwise the web may not work correctly.
helpText->setText(tr("Open-Sankoré directory is present on the disk. It's possible to import the Open-Sankoré documents into OpenBoard as the preferences. Pushing \"Proceed\" will close OpenBoard and run the importer application."));
helpText->setText(tr("Open-Sankoré documents are present on your computer. It is possible to import them to OpenBoard by pressing the “Proceed” button to launch the importer application."));
warningText->setText(tr("You can always access the OpenBoard Document Importer through the Preferences panel in the About tab. Warning, if you have already imported your Open-Sankore datas, you might loose your current OpenBoard documents."));