• Merge pull request #7 by @jborza that improves voice preview and documentation.
• Fixed the issue when a voice is selected, the voice mixer tries to pre-select that voice and ignores existing profiles.
• Fixed the error while renaming the default "New profile" in the voice mixer.
• Fixed subtitle_combo enabling/disabling when a voice in the voice mixer is selected.
• Prevented using special characters in the profile name to avoid conflicts.
• Improved invalid profile handling in the voice mixer.