If you only want translations for the Na'vi language parts, search for "English Forced" subtitles.
If your subtitle is off by a few seconds, you can fix it manually in real-time or permanently. Option 1: Quick Sync (VLC Media Player) subtitle Avatar.-.Extended.Collectors.Edition.2...
For the (the version featuring three different cuts, often running around 2 hours and 58 minutes), the following guide covers how to find, sync, and fix subtitles. 📥 Finding the Right Subtitle If you only want translations for the Na'vi