Merged with default branch to prepare release 21.7. maintenance release-21.07

Updated Russian translations.

Updated the install script for the required PyQt6-QScintilla version. eric7

Updated Russian translations. eric7

Updated Spanish translations.

Updated Spanish translations. eric7

Corrected some typos. eric7

Fixed another flags use. eric7

install.py: added the 'wheel' to the list of modules to be installed. eric7

Fixed some issues related to non-existing flags. eric7

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