[Refactor] Refactor Language keyboards objects to follow SOLID principles

Terms

• I have searched open and closed feature requests
• I agree to follow Scribe-iOS' Code of Conduct

Description

The LanguageKeyboards group contains sub-groups for each supported languages by Scribe.

Those sub-groups contains files that exposes app level functions and enums that are all similar but are not following any strict protocol.

The end goals here would be the following:

• Extract all the keyboards related constants into a dedicated package / framework within a common workspace file
• Expose dedicated protocols for language keyboards that exposes the required functions and constants
• Refactor all language keyboards to adhere to the newly created protocols
• Refactor the Info.plist to move the constants into a single localised file and create custom Build Settings to exposes the constants to a single Info.plist file (or find another solution)
• Extract all the common keys between keyboard to constants to avoid manually hardcoded strings
• Add unit tests to ensure each language keyboard is working has expected

Contribution

No response

Start by locating the LanguageKeyboards language sub-groups and their Info.plist entries, then review how their functions, enums, and constants currently differ. The scope includes shared keyboard constants, protocols, workspace packaging, localized settings, and unit tests; done means all listed language keyboards follow the agreed structure and have coverage.