[Feature Request] Add explicit language selection for voice transcription

Bug Description
Voice transcription should support explicit language selection (e.g., pt-BR). Its only work well in english.

Environment Info

• Platform: win32
• Terminal: windows-terminal
• Version: 2.1.73
• Feedback ID: ddfca493-875b-425b-be56-165ddec9552a

Errors

[{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at EEH (B:/~BUN/root/src/entrypoints/cli.js:2565:17246)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T19:40:55.373Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server greptile invalid: Missing environment variables: GREPTILE_API_KEY\n    at EEH (B:/~BUN/root/src/entrypoints/cli.js:2565:17246)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T19:40:55.373Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at EEH (B:/~BUN/root/src/entrypoints/cli.js:2565:17246)\n    at async j (B:/~BUN/root/src/entrypoints/cli.js:4635:16528)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T19:40:56.172Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server greptile invalid: Missing environment variables: GREPTILE_API_KEY\n    at EEH (B:/~BUN/root/src/entrypoints/cli.js:2565:17246)\n    at async j (B:/~BUN/root/src/entrypoints/cli.js:4635:16528)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T19:40:56.172Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at EEH (B:/~BUN/root/src/entrypoints/cli.js:2565:17246)\n    at async E (B:/~BUN/root/src/entrypoints/cli.js:4635:17244)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T19:40:56.185Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server greptile invalid: Missing environment variables: GREPTILE_API_KEY\n    at EEH (B:/~BUN/root/src/entrypoints/cli.js:2565:17246)\n    at async E (B:/~BUN/root/src/entrypoints/cli.js:4635:17244)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-11T19:40:56.185Z"}]