Added a few multi-language support to the guide book #4208
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Description
Some parts of the guide book don't have multilingual support, so I tried to add some myself. But many places are too difficult to modify. Sorry, this is all I have done.
Proposed changes
Added two places of multi-language support for the guide book
Related Issues (if applicable)
Checklist
Nonnull
andNullable
annotations to my methods to indicate their behaviour for null values