Updated Russian translations.

Code Style Checker: added checks for naive uses of datetime classes.

Merged with updated Spanish translations.

Spanish i18n update for eric6 default branch

Code Style Checker: added check for line continuation methods not suggested by PEP-8.

SubstyledLexer: fixed an issue when loading a .cpp file.

Code Style Checker: added check for commented code that should be removed.

install.py: added a Info.plist entry to support macOS Dark Theme.

UserInterface: cope with a situation where self.__webBrowserProcess is None for some unknown reason.

README.rst: Fixed some issues in the text.

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