Merged with default branch to prepare new release. maintenance release-20.06

Released Spanish translations update.

Eric 6 Spanish I18n update for default branch.`

Updated Russian translations.

Re-added the eric6 QtHelp files.

Updated source docu.

Updated translations.

CodeStyleCheckerDialog: changed the dialog layout to get more space for the result list.

Utilities: changed a doc string to not need a code style warning suppression anymore.

Removed the capability to configure the Qt translations directory via environment variables.

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