In this feature you can enable offline access for Google Docs in 40 languages see this
Here is how to install this feature.
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2. You'll then be asked to allow https://docs.google.com as a trusted site. Check the box next to 'I trust this site. Allow it to use Google Gears.'
3. Then, click Allow.
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4. Once you've enabled Google Gears, you'll be able to edit your existing documents anywhere, even without an Internet connection.
To know more about this feature you can access to this link