Put the full language name in the system prompt

[mrubens]

Important

Update addCustomInstructions to use full language names from LANGUAGES mapping and handle unknown codes, with corresponding test updates.

• Behavior:
  • addCustomInstructions in custom-instructions.ts now uses full language names from LANGUAGES mapping.
  • Handles unknown language codes by using the code as the name.
• Tests:
  • Updated tests in sections.test.ts and custom-instructions.test.ts to check for full language names and codes.
  • Added test for handling unknown language codes in custom-instructions.test.ts.
• Misc:
  • Consolidated LANGUAGES mapping in language.ts and removed duplicate in LanguageSettings.tsx.

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Latest commit: 2575e1e

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[ellipsis-dev]

Consider using alias imports (via tsconfig paths) to simplify the relative path if possible.

Suggested change

	import { LANGUAGES } from "../../../../src/shared/language"
	import { LANGUAGES } from "@src/shared/language"

[ellipsis-dev]

Consider using a module alias (e.g., @/shared/language) for the language import instead of a deep relative path to improve maintainability.

Suggested change

	import { LANGUAGES } from "../../../../src/shared/language"
	import { LANGUAGES } from "@/shared/language"