Fix language selector

[mrubens]

Important

Fixes language selector bug by ensuring preferredLanguage is included in system prompts and custom instructions, with tests added for verification.

• Behavior:
  • Fix bug in Cline.ts where preferredLanguage was not included in the system prompt.
  • Update generatePrompt() in system.ts to include preferredLanguage in custom instructions.
• Tests:
  • Add tests in sections.test.ts to verify addCustomInstructions handles preferredLanguage correctly.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 8bbb64d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
roo-cline	Patch

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