Merged with default branch to prepare a new release. maintenance release-20.12

Utilities: removed some obsolete functions.

PipFreezeDialog: fixed an issue refreshing the data.

Updated Russian translations.

Updated source docu.

Updated translations.

WebBrowserWindow: removed the use of QTextCodec to prepare the Qt6 migration.

Utilities: fine tuned the list of supported codecs.

Fixed a code style issue.

Utilities: extended the list of supported codecs.

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