[FEATURE] Refactor Lesson Storage Mechanism

[xenom34]

Refactor Lesson Storage Mechanism

Is your feature request related to a problem? Please describe.

Currently, lessons are stored directly in the strings.xml file, which is inefficient for managing vocabulary changes. This file is becoming increasingly heavy and difficult to handle.

Describe the solution you'd like

I would like to change the way lessons are stored to a more manageable and efficient system. The new solution should be compatible with the existing classes such as LessonsStorage.java and Lesson.java. Justified modifications to these classes are acceptable as long as the risk of bugs is minimized.

Describe alternatives you've considered

The developer is free to propose any alternative solution to the current strings.xml storage method, as long as it improves the manageability and efficiency of lesson storage.

Additional context

Ensure that the new storage mechanism integrates smoothly with the current system and minimizes potential bugs during the transition.