Add automatic translation feature

[cary-rowen]

PR Description

New Feature
A new autoTranslate layer command is introduced to control whether automatic translation is enabled. This feature automatically translates the last spoken text by NVDA into a specified language, reducing the need for frequent manual translation.

Default State

• The auto-translate feature is disabled by default.

User Interaction

• Users can toggle the auto-translate feature via the V command in the layer commands, or bind it to other gestures.

Method Changes

• translateAndCache:
  • In auto-translate mode, if translation fails, the original text will be read aloud without a failure message.
  • In non-auto-translate mode, if translation fails, the message “Translation failed” is announced (default behavior).

Change Overview

• script_toggleAutoTranslate: Toggles the auto-translate mode.
• _localSpeak: In auto-translate mode, translates and speaks the translated text; if translation fails, the original text is spoken.
• script_ITLayer: Adds the V key as a shortcut to toggle the auto-translate mode after NVDA+Shift+t.

Test Cases

• Verify the behavior when translation succeeds or fails in auto-translate mode.
• Verify the behavior when switching the auto-translate mode and ensure it functions as expected.