v7.4

Perform spelling checking via the English dictionary and improve the backup_converter.rb script.

Change Log

• new features:
  • perform spelling checking via the English dictionary:
    • install the English dictionary for the Pspell library in the Docker image;
    • add the Latin characters into the word pattern for spelling checking;
    • add checking via the English dictionary:
      • to the MistakeController::actionCheck() method;
      • to the MistakeController::actionList() method;
• fix the bugs:
  • improve the backup_converter.rb script:
    • describe the dependency versions;
    • fix the bug with disabling copying to a clipboard;
• perform refactoring:
  • of spelling checking:
    • move the word pattern for spelling checking to a constant;
    • add the MistakeController::initPspells() method;
    • add the MistakeController::checkWord() method.